Pregnancy calendar - your week-by-week guide to the stages of pregnancy

We've got all the information you need about your body, your emotions and your baby, week-by-week of your pregnancy.

Find out about the stages of your pregnancy

  • Weeks 1-12 infographic

    First trimester: weeks 1 to 12

    You're pregnant: congratulations! The first weeks of your pregnancy are a vital time as your body gets busy building a baby. How exciting!

  • weeks 13 - 28 infographic

    Second trimester: weeks 13 to 28

    The second trimester is the middle three months of your pregnancy. This is a time when lots of women tell the world they’re pregnant and begin to feel like the pregnancy is more ‘real’.

  • week 29-40  infographic

    Third trimester: weeks 29 to 40

    The end of your pregnancy is in sight. It won't be long until your baby arrives. Feelings at this stage of pregnancy tend to vary from tiredness and worry to excitement about the baby.

What is a trimester?

People often talk about pregnancy as being nine months long. In fact it’s usually slightly longer than this. Your pregnancy is measured from the first day of your last period rather than the day you actually conceived.

A pregnancy generally lasts around 40 weeks, and your dates are referred to in weeks because this is more accurate than talking in months.

Your pregnancy has three phases, called trimesters, and each trimester is about three months long.

Each trimester has its own mix of highs and lows, and you can find out what to expect in this pregnancy calendar. The information in the calendar may be helpful for the people close to you as well.

Confused about pregnancy weeks? Wondering whether to count from the day you conceived or your last period? Discover how to count your pregnancy in weeks and months on the BabyCentre website. You can also join your BabyCentre birth club to meet others due at the same time as you, share stories, and swap tips and advice.

Read more

  • Pregnant woman looking anxious.

    Mental health before, during and after pregnancy

    Although it’s normal to have periods of worry and stress when you’re pregnant, some women have feelings that don’t go away and this can be a sign of something more serious.

  • Pregnant woman exercising on cross-trainer.

    Exercise and activity in pregnancy

    People may tell you that pregnancy is a good time to put your feet up. If your pregnancy is uncomplicated it is actually much healthier for you and your baby to exercise while pregnant.

  • Woman on treadmill at gym.

    Weight management in pregnancy

    Although you will be putting on weight in pregnancy as your baby grows, limiting the amount of extra weight gain in pregnancy will improve your health and your baby's, both now and in the future.

  • Mother and newborn baby.

    Labour & birth

    Most women worry about how they will cope with the pain of labour and birth. You may worry too, especially if it is your first baby and you do not know what to expect.

  • Woman in hospital bed being comforted by health professional.

    Pregnancy complications

    Sometimes things go wrong during pregnancy and you need extra care

  • Pregnant woman with sharp pain in her stomach.

    Is it serious? Pregnancy symptom checker

    In many cases the symptoms in this section can be treated easily and will not lead to a serious complication. But sometimes they are signs of something more serious.


1. NHS Choices [accessed 2 February 2015] “Your pregnancy week by week”

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Last reviewed on April 1st, 2014. Next review date April 1st, 2017.

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  • By ellehere (not verified) on 27 Sep 2018 - 08:16


    Am new and my husband are trying to start our family, for last few months I have started tracking my dates..and tracking when I start ovulating... As per whattoexpect- Many women use ovulation predictor kits, which identify the date of ovulation 12 to 24 hours in advance by looking at levels of luteinizing hormone, or LH, the last of the hormones to hit its peak before ovulation.
    Is any one using predictor kit ??? Any other way to know best ovulation time??

  • By Midwife @Tommys on 28 Sep 2018 - 12:09

    Hi - thank you for your message.

    Ovulation usually happens about 10 to 16 days before the start of your next period, so it helps to know your cycle length before you start trying to conceive.

    You may never have considered when you might ovulate within your cycle, and if you have been using a hormone contraceptive such as the Pill, you won’t have had a natural menstrual cycle for a while.

    As a first step, mark on your ovulation calendar the dates that you bleed during a period. You can then count how many days from the first day of your period to your next period to work out the length of your cycle.

    Cervical mucus changes
    The cervix secretes mucus throughout the menstrual cycle, starting off sticky white and gradually becoming thinner and clearer.

    Before and during ovulation the mucus increases and becomes much thinner, slippery and stretchy. Women often compare it to raw egg white.

    This thinner mucus is designed to help the sperm swim easily through it. It indicates that you are in your fertile phase, so this is the time to have sex if you want to get pregnant, but use contraception if you do not!

    The last day you notice the wetter secretions is sometimes known as ‘peak day’ and for most women this occurs very close to the time of ovulation.

    You can also find out about your menstrual cycle by keeping a note of your temperature each morning when you wake up. Your temperature rises by about 0.2°C when ovulation has taken place.

    As it is only an indicator that you have ovulated, and doesn’t tell you when your fertile time starts, this is not very useful for most women.

  • By Hannah green (not verified) on 26 Sep 2018 - 17:41

    I had a scan on the 18/09/18 and was told im 6 weeks pregnant (7 weeks now) but they never told me my due date? My last period was the 28/07/18 so i thought i was 7 weeks at my scan but the fetus only measured 3.2mm with heartbeat. Is that normal also?

  • By Midwife @Tommys on 27 Sep 2018 - 10:29

    Hi Hannah, Thank you for your comment.

    If the first day of your last period was on the 28th July then your due date should be around the 4th May 2019. It can be normal for your dates to be out by a few days, this will all depend on when you ovulated, but your dates do add up correctly. When you have your 12 week scan, they will give your actual due date via scan as this is when it is the most reliable. Hope this helps, Take Care, Tommy's Midwives x

  • By Mavis (not verified) on 21 Mar 2018 - 12:36

    29th of December 2017 was my last date of periods.l had sex only on the 8th January 2018, l found out beginning of March that lm pregnant . How old is my pregnancy

  • By Midwife @Tommys on 22 Mar 2018 - 14:52

    Hi Mavis, Thank you for your comment and congratulations on your pregnancy.

    If the 29th December was the first day of your last period then your due date would be around the 4th October. This would make you around 7 weeks and 5 days today. Hope this helps, take care Tommy's Midwives x

  • By Millicent (not verified) on 25 Sep 2018 - 15:11

    I got period on 02/08/2018.i notice am pregnant, please how many weeks

  • By Midwife @Tommys on 26 Sep 2018 - 11:21

    Hi Millicent
    Using the date you gave of 8th aug as the first day of your last menstrual period, assuming you have a 28 day cycle, you are approx 8 weeks pregnant today.
    You need to go to your GP to start your antenatal care with a midwife and arrange for your first scan.
    Congratulations. All the best
    Tommy's Midwife

  • By joy (not verified) on 2 Mar 2018 - 16:59

    i was suppose to see my mens on 30-31 of feb 2018 but it did not come out then on 11 of feb i had a hcg home urine test tested positive i have all the sign to show i can be pregnant but i have not done blood test but do you tink am having a baby or should i do blood test.

  • By Midwife @Tommys on 5 Mar 2018 - 13:00

    Hi Joy,
    From your message I am unsure when your took your pregnancy test, if it was after your bleeding then this is fine and a home urine test is all you need to test for a pregnancy and I would advise for you to see your GP and arrange for a referral to maternity care. If the test was prior to bleeding then I would advise for you to re take the test to confirm if you are pregnant. If you are not already then we would strongly advise for you to be taking a daily folic acid supplement. Best wishes, Tommy's midwives

  • By mellisa (not verified) on 20 Mar 2018 - 12:46

    hi joy,

    if you are doubtful of the pregnancy test then have yourself checked by an OB Gyne. In this way, you can ensure that you are really having a baby or not.


  • By Anonymous (not verified) on 14 Nov 2017 - 09:53

    The first day of my last period was 2nd of october so im only about 6weeks pregnant but im worried that wearing a tight pair of jeans could harm my unborn baby, does anyone know if it could? And if not the what could harm my baby?

  • By Midwife @Tommys on 15 Nov 2017 - 11:05

    Hi, Thank you for your comment.

    Wearing skinny jeans wont harm your baby. Your baby at this stage is very low down in your pelvis, well protected in the uterus. As your pregnancy progresses, you may want to wear looser fitting clothes so that you can feel more comfortable.
    There are a few things to avoid in pregnancy that could cause potential harm to your baby but please don't be alarmed, please go to the following link for more information about what to avoid in pregnancy, this will give your a straight forward helpful guide that will make it easy for you to follow:

    There are also certain medications that you should avoid in pregnancy like ibuprofen but if you do need pain relief for a headache then you can take the occasional paracetomol as long as you don't exceed the recommended dosage. If you have any concerns, then you can always speak to your GP or midwife. If you need any further advice or support then please contact the Tommy's midwives on [email protected] or call us Monday to Friday 9am-5pm 0800 0147 800. Hope this helps, take care, Tommy's Midwives x

  • By amy (not verified) on 7 Sep 2017 - 07:57

    I did a home pregency test on the 14thJuly I did another test two wks ago and it came back positive I slept with Someone on the 2nd of August and again on the 6th of august would I be pregnant to his person can u fall pregnant that soon afta the first test on July 14th was negative

  • By Midwife @Tommys on 7 Sep 2017 - 09:49

    Thank you for your comment.
    You can fall pregnant after a negative test depending on your monthly cycle.
    Have you had a period since your 1st pregnancy test in July? If so, then it's likely you conceived after you had sex in August and would be pregnant to this person
    Pregnancy tests measure levels of pregnancy hormones in your urine; these levels increase very quickly at the start of the pregnancy-If you haven't had a period since your Ist pregnancy test then the levels may have increased enough to give the positive result you had 2 weeks ago.
    Please see your GP or contact your local maternity unit so that you can have your dating scan which will confirm how many weeks pregnant you are ( and therefore when you conceived) and start your pregnancy care.
    I have attached 2 links that you may find helpful
    Hope this helps
    Tommy's Midwife

  • By Annet (not verified) on 25 Aug 2017 - 03:20

    How many weeks am I my last period date was 26 Nov 2016

  • By Midwife @Tommys on 25 Aug 2017 - 16:52

    Hi, you EDD will be on your scan which you would have had at about 12 weeks pregnant. If you did not have your scan then the first one you had will give you your due date. The scan EDD is what is used in your pregnancy, your period dates are only used as an estimation at the beginning of your pregnancy. It can also be affected by the length of your cycle too.

  • By anonymous (not verified) on 20 Aug 2017 - 20:34

    what can happen to an unborn baby if the father is a heavy drug taker, and i have drank alcohol in the first 4 weeks of pregnancy, as i didnt know i was pregnant?

  • By Midwife @Tommys on 23 Aug 2017 - 16:07

    Hi, thank you for your message it is a difficult question to answer in regards to your partner but many women unaware that they are pregnant do drink and take drugs before realising.
    If you have stopped drinking now this is good news for your pregnancy. If you would like more information or need help to stop drinking Talk to Frank is a good place to start.
    We are also here to talk on 0800 0147 800 in confidence.
    Warm wishes
    Anna -Tommy's Midwife

  • By Anonymous (not verified) on 4 Aug 2017 - 17:57

    My last period was june 22nd and my doctor says I'm a maximum of 6 weeks so my due date is between 25-29th March. When would I have conceived?

  • By Midwife @Tommys on 7 Aug 2017 - 11:23

    If you have a normal length regular cycle you would have conceived between the 2nd and 9th July. Your scan at 12 weeks will confirm your dates.

  • By Kimberley (not verified) on 5 Jul 2017 - 14:35

    Hi I had my period on the 17th of may came off the pill on the 21st bled again on the 4th of june and just got a positive pregnancy test any idea when I conceived?

  • By Midwife @Tommys on 6 Jul 2017 - 13:27

    Hi Kimberly, we can never be really sure about the time of conception as sperm can live in the body for up to 7 days. Normally midwives date a pregnancy from the first day of your last period, which would be 4th June, women tend to ovulate around 14 days after this, so it could be possible that conception occurred around this time but again we can never be sure of the actual time of conception. If you have had a positive pregnancy test and you are unsure of your dates then please see your GP who may be able to refer you for an early scan to see how many weeks you are into your pregnancy. Hope this helps, Best Wishes Tommy's Midwives x

  • By Kenesia (not verified) on 29 Jun 2017 - 20:50

    My last period was on the 15th of may 2017 . I had a etopic pregnancy and lost a tube last june 2016 at 5 weeks so im so scared to do a test just hoping this baby will stay im praying it will all go well

  • By Midwife @Tommys on 30 Jun 2017 - 10:00

    Hi, it is totally understandable that you are feeling anxious in this pregnancy and these early weeks are scary for you. According to your dates, if you have a regular cycle then you are about 6+3 weeks pregnant. It is important that you are taking your folic acid supplement and any concerns please see a GP or go to A+E straight away. I am sure you are aware of what to look out for but here is a link to our info if this helps at all: Take care, Tommy's midwives x

  • By caroline mcclean (not verified) on 15 Aug 2017 - 21:09

    i had my period on the 28th of may and i have not seen one since

  • By Midwife @Tommys on 16 Aug 2017 - 09:00

    Hi Caroline. If you have not had a period since 28th May and have done a pregnancy test and it is negative, then it would be sensible to book to see your GP who will likely refer you onto a gynecology specialist doctor. If you have a positive pregnancy test, then you also need to either make an urgent GP appointment or contact your local midwives (you can google your nearest hospital and find a contact number or email for the midwives and access maternity care that way too.)If you have any further issues you would like to discuss, feel free to email or call us, we would be happy to help. All the best

  • By Anonymous (not verified) on 11 Jun 2017 - 21:00

    Hi i need help I am 24 weeks pregnant wen did I conicved. On the 10th dec I had sex with someone thn on the 8th of Jan had sex with someone else. My dun date is on the 30th sec plz help

  • By Midwife @Tommys on 12 Jun 2017 - 09:41

    If you are 24 weeks pregnant today and due on 30th September, conception would have been approximately between 4th and 10th January. Hope this helps

  • By CC (not verified) on 10 May 2017 - 14:56

    Hi, I've posted on here a couple of times before now, while I was pregnant, when I miscarried etc.
    I had a confirmed early full mc on 22 March. My first period arrived 29 April - 3 May. I am now experiencing a watery pink discharge on and off, tender breasts, slight cramping and waves of nausea since 8 May.
    Is this just my hormones still sorting themselves after the mc? Ovulation bleeding, or is it possibly implantation?

  • By Midwife @Tommys on 10 May 2017 - 15:04

    Hi CC
    I am sorry to hear of your miscarriage, i hope you are doing ok?!
    It is difficult to know. If you have had a full, normal period and then had unprotected intercourse between the 3rd May and now, then it is possible that you have conceived again. However, it would be too early for you to be feeling nauseated and have tender breasts due to another pregnancy within less than a week as the hormones do take a few weeks to build up in your system before they begin to make you feel this way.
    If the pain, discharge and cramping continues for over 24 hours, I would seek medical review - either with your GP or at an early pregnancy unit.
    Please take good care of yourself.

  • By Melissa (not verified) on 25 Apr 2017 - 13:44

    I lost twins in December at 9 weeks. I have found out i am pregnant again, i had 2 normal periods and missed Aprils and took a test which was positive. My last period was 8th March. I am just so anxious i will miscarry again.. I had a awful experience in Dec and ended up having a womb infection. I am just so concerned i will have another missed miscarriage..

  • By Midwife @Tommys on 26 Apr 2017 - 14:50

    Hi Melissa,
    Thank you for posting. I can only imagine how nervous you must be after losing your twins in December.
    Your GP can arrange an early ultrasound scan at around 7 weeks for reassurance. Early Pregnancy Units will accept referrals of women who have had a previous loss – so it is worth speaking to the GP about this and also discussing fears and anxieties so your GP can support you.
    Please be reassured that anxiety in pregnancy can be very common, it is worth knowing that NICE Guidelines suggest that GPs refer pregnant women suffering from anxiety or mild depression in pregnancy for counselling (short-term talking therapy or CBT). This referral can be fast-tracked under a programme called IAPT ( Improved access to Psychological therapies) . Speak to your GP if you feel the anxiety is overwhelming and request a referral as soon as possible.
    This will not only help you with managing your pregnancy but treatment in pregnancy for high anxiety/depression will also significantly reduce your risk of developing postnatal depression.
    Please know that we are also here to listen and many women call us in the early days of pregnancy where every day feels like a lifetime. Tommy's PregnancyLine is 0800 0147 800
    With very best wishes in this pregnancy
    Tommy's Midwives

  • By becky (not verified) on 16 Apr 2017 - 19:51

    I had a miscarriage at the end of January start of February and I didn't gave a period in between before getin pregnant again I found out on the 19th of march I was pregnant I'm just wondering wen I cud of got caught and how many weeks I am thanks.

  • By Midwife @Tommys on 18 Apr 2017 - 09:56

    I'm so sorry to hear of your miscarriage earlier this year - I hope you had support and care given to you during such a difficult time.
    It is possible to get pregnant straight after a miscarriage - I would advise that you arrange an appointment either with your GP or your local midwife if you can for early pregnancy care as well support and advice on determining how many weeks pregnant you are.

  • By Anonymous (not verified) on 23 Feb 2017 - 13:09

    hi there,

    have just found out I'm 4 weeks pregnant, haven't officially been to gp but have done 2 positive tests. I suffer from GAD generalised anxiety disorder and I just worry now I will do my baby damage with excessive worrying. I don't take medication, I have taken sleeping tablets in the past and would like to ask my gp if occasionally I need to take one to get some sleep before work can it cause serious problems? PS Now the fun begins!!!

  • By Midwife @Tommys on 23 Feb 2017 - 14:00

    Hello and congratulations on your pregnancy. Remember that any medication taken in pregnancy should be under the guidance of your doctor only and it would be sensible to discuss these issues at your appointment soon. Also it would be worth thinking about your exercise regime as, If you weren't very active before your pregnancy, there are lots of small changes you can make in your day-to-day life that will make a big difference to your physical and mental health which will positively impact on your baby. Good luck and keep in touch

  • By anxious (not verified) on 20 Feb 2017 - 00:55

    Found out I'm pregnant about 2 weeks ago I feel like i can already feel him or her moving and my belly already swelling is that normal or do you think I'm further along? Possible advice would be very welcome and appreciated thank you x

  • By Midwife @Tommys on 20 Feb 2017 - 09:19

    Congratulations on your pregnancy news - I hope you are keeping well.
    Whilst it is too early to be feeling baby's movements what you may be experiencing is changes in your digestive system adjusting to pregnancy. Often women can feel bloated, full, windy or constipated due to hormonal changes in early pregnancy.
    If you haven't already make an appointment to see your GP so you can be referred for antenatal care.

  • By Rochelle (not verified) on 16 Feb 2017 - 17:19

    I'm not sure of my due date. I know it works of the first day of your last period however I was spotting three days before? So do I go by the spotting date? Or my actual period?

  • By Midwife @Tommys on 17 Feb 2017 - 11:02

    We would initially date a pregnancy from the first day of your actual period until you have your initial dating scan between 11-14 weeks of pregnancy, this scan will then give you your final estimated due date for the pregnancy. Take care, Tommy's Midwives

  • By Anonymous (not verified) on 16 Feb 2017 - 13:25

    Hi. I've calculated my due date and the days I Conceived are pretty accurate as I know when I had intercourse however my ultra scan told me I'm 13weeks when I thought I was 11weeks and when I count back 13weeks on the calender, it falls on the first day of my last period. I don't get it i had sex at the end of November to the beginning of December
    Please help

  • By Midwife @Tommys on 16 Feb 2017 - 15:28

    You are correct. A pregnancy is dated from the first day of your last period and not from the date that you had intercourse. That would therefore mean that you are 13 weeks.

  • By Georgia (not verified) on 11 Feb 2017 - 19:05

    I only found out last week I am pregnant! With my second. I'm not sure how far gone i am as I have missed 2 periods and my midwife appointment is on the 23rd February. I think I'm further than 8weeks as I'm getting symptoms and feelings that I had with my son when I was around 15 weeks.
    Hope someone could help and hope it made sense. Thank you x

  • By Midwife @Tommys on 13 Feb 2017 - 09:15

    Hi Georgia. Congratulations on your second pregnancy.
    Using our pregnancy calculator, you could enter the date of the first day of your last menstrual period, and the average length of your cycle to work out roughly how many weeks pregnant you are and when your baby will be due. If your dates are unclear, then your first ultrasound scan with give an estimation based upon the measurements of your growing baby.

  • By Kj (not verified) on 9 Feb 2017 - 12:50


    I had a silent M/C at 8 weeks and found out at my 12 week scan. They took me in for an evacuation procedure the same day on the 4th Jan 2017. I bleed for around 7 days after this but I have not had a period since. I took a pregnancy test and it said I was pregnant but my HCG levels are only 10. Could this be left over residue of the old pregnancy or a new pregnancy. I am so confused. I have taken three tests 2 of which were positive and one last night which was so feint that it makes me think I am loosing my baby again. Is it possible that the tests are just detecting my old pregnancy? Any help very much appreciated. I hope all that made sense :)

  • By Midwife @Tommys on 10 Feb 2017 - 11:30


    Firstly I am so sorry to hear that you have been through a miscarriage recently. Yes you do make sense and absolutely it can be a little confusing. It can take several weeks for your hormone levels to return to under 5 (non-pregnant level), it is possible for this to take up to 6 weeks and varies depending on the pregnancy and the woman. It is possible that the pregnancy tests are still showing up from the pregnancy that you miscarried, however it is also possible for you to have ovulated and become pregnant again if you have had intercourse during this time. How strong or faint the line is does not necessary tell you how strong the hormone level is within your body. I would suggest to repeat the pregnancy test in about 5 days time, if positive then see your GP for blood test and see if the hormone level is rising sufficiently for another pregnancy. If the test is negative then it shows that the hormone level has fallen enough to non-pregnant levels. I hope this helps, if you would like to talk further please do email us [email protected]

  • By Midwife @Tommys on 25 Jan 2017 - 14:39

    Hi, thank you for posting most women start to feel their baby move between 16 and 24 weeks so you have a few more weeks to wait until you feel movement. After your scan you will be made aware that your little baby is already super active, growing and developing you just don't feel the movement yet as he or she is still so tiny ( 30 mm at 10 weeks).
    Wishing you a healthy pregnancy!
    Tommy's Midwives

  • By jade (not verified) on 25 Jan 2017 - 06:35

    At what stage do u feel baby move as I am 10weeks and don't feel movement

  • By Midwife @Tommys on 18 Jan 2017 - 10:17

    Hi please if you need to talk and don't have internet you can call us on 0800 0147 800
    Thank you
    Tommy's Midwives

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