First trimester: key stages
The first trimester begins on the first day of your last period and lasts until the end of week 12. This means that by the time you know for sure you're pregnant, you might already be five or six weeks pregnant!
A lot happens during these first three months. The fertilised egg rapidly divides into layers of cells and implants in the wall of your womb where it carries on growing. These layers of cells become an embryo, which is what the baby is called at this stage.
During this trimester, your baby grows faster than at any other time. By six weeks, a heartbeat can usually be heard and by the end of week 12, your baby's bones, muscles and all the organs of the body have formed. At this point, your baby looks like a tiny human being and is now called a fetus. He or she will even be practising swallowing!
When am I due?
When will I see a midwife?
Your first midwife appointment (also known as antenatal appointment) is the 'booking' appointment. This usually happens between week 8 and 10 of your pregnancy. Find out how to register with a midwife and when your appointments will be here.
Keeping your baby safe
There are some things that you can do during pregnancy that have an effect on your baby. Find out about them by clicking the link below.
Not sure whether you are pregnant?
Find out about the symptoms that mean you may be pregnant here.
Your physical and mental health in pregnancy
Don't forget that your mental health is just as important as your physical health. It's normal to feel some anxiety and stress but it shouldn't be ongoing. If what you’re feeling isn’t normal for you, talk to your GP or midwife about it. They are there to help.
Exercise, such as yoga, has been shown to reduce anxiety and is a great way to stay active during your pregnancy, too.
Track your baby's development
Sign up to a free pregnancy email from our midwives to track your baby's development and give you reminders of all you need to know through the nine months of pregnancy. Click here to sign up.
Congratulations on your exciting news! Tommy’s midwives are here to guide you through every stage of your pregnancy and help you get to know your growing baby.
It’s week five and your baby’s tiny face is already starting to form - the beginnings of a tiny nose and eyes are already taking shape.
By the end of this week your baby will have grown to the size of an orange pip.
Your baby, who was once the size of bean, is now the size of a grape.
Here comes a growth spurt: Your little one will double in size this week.
Measuring about 22mm long, your baby is now as big as a strawberry.
Your uterus is the size of a large orange now, and your baby is around 3cm long.
You're now coming up to the end of the first trimester and your baby is starting to look like a baby! Your bump may start to show soon.
It’s been a busy few weeks: Everything is now in place - the organs, limbs, bones and muscles are in place and growing.
NHS Choices. Your pregnancy week by week http://www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-week-by-week.aspx#close (Page last reviewed: 28/02/2017 Next review due: 28/02/2020)
Macdonald S, Magill-Cuerden J (2012) Mayes’ Midwifery, 14th edition, London, Ballière Tindall
NICE (2008) Antenatal care for uncomplicated pregnancies, NICE Clinical Guidelines 62. National Institute for Health and Care Excellence http://publications.nice.org.uk/antenatal-care-cg62Hide details
ℹLast reviewed on June 28th, 2018. Next review date June 28th, 2021.
By Midwife @Tommys on 5 Jun 2018 - 14:16
Thank you for contacting us. I think it would be best for you to contact your GP for a full assessment. Your lack of period may be hormonal due to use of the pill or it may be normal for you due to your history of irregular periods.
By Melissa (not verified) on 1 Jun 2018 - 05:02
Had my last period on the May 8th. Took a test today May 31st. How many weeks do you think I am
By Midwife @Tommys on 1 Jun 2018 - 10:04
We date a pregnancy according to the first day of your last period, therefore given the date of the 8th of May you would be about 3 weeks and two days pregnant if you have a regular 28 day cycle.
By Stace (not verified) on 4 Jun 2018 - 13:29
Hi I am currently 5 days late on my period me and my partner have new trying for 5 years i am very scared to take a test just incase it's not the answer I won't not really any pregnancy symptoms just really bad wind is this a sign of early pregnancy?
By Midwife @Tommys on 6 Jun 2018 - 12:28
I would advise that you take a test when your period is 7-10 days late to get the most accurate positive or negative result. If you take a test too early, it can give a false negative result as the pregnancy hormones (hcg) have not yet had time to build up in your system to be shown by the test.
If the test is negative and your period is still late, then i would recommend that you go to your GP for a review and explain that you have been trying to conceive for 5 years. They may send you for a gynecology review and request some bloods are taken from you to start the ball rolling.
Bad wind isn't an obvious sign of early pregnancy, it is just too generic to know without doing a test.
I wish you all the best
Sophie, Tommy's Midwife
By Jazmin (not verified) on 1 Jun 2018 - 04:33
Hello I'm Jazmin, I have currently missed my period it's already 5 days late should I take a pregnancy test or should I wait longer? My period was supposed to be 5/25/18
By Midwife @Tommys on 1 Jun 2018 - 09:57
If you are five days late on your period and have been having intercourse then yes it would be fine to take a pregnancy test now.
If you are trying to conceive then, if you are not already, we would advise for you to be taking a folic acid supplement.
By Sahitya (not verified) on 30 May 2018 - 03:05
My last period was 25th April now 6 days late period,pregnancy test was negative on 4th day in hospital so doctor conducted blood test and thyroid test.Thyroid was normal but prolactin was 39 but i have pregnancy symptoms .please let me know whether i take medication for this
By Midwife @Tommys on 1 Jun 2018 - 09:55
If you are not pregnant then I am afraid that we would be unable to advice whether you need medication or not as raised prolactin levels can be due to several things. If you feel that you maybe pregnant, the prolactin levels rise in pregnancy so this would be very normal and there would be no need for medication. You may want to repeat your pregnancy test in a few days if you continue to have symptoms. Otherwise I hope you have a follow up with your doctor.
By Kyushu Gor (not verified) on 1 Jun 2018 - 13:32
My last periods were on7th May so How could I know Am I pregnant or not because always 1 week prior my periods come
By Midwife @Tommys on 1 Jun 2018 - 16:53
You won't necessarily know unless you are getting very obvious symptoms. A pregnancy test at this stage may not detect a pregnancy as your hormone level may not yet be high enough. I would advise to wait, and if your period does not come when due then to take a pregnancy test. In the meantime if you are trying to conceive then it is important to be taking a folic acid supplement.
By China (not verified) on 29 May 2018 - 18:14
I had my last period on 17 April, how many weeks am i?
By Midwife @Tommys on 30 May 2018 - 16:08
Using your last menstrual period date of 17th April, the most pregnant you would be is around 6 weeks.
When you go for an ultrasound scan, they will measure the baby and give you a more accurate gestation and due date.
Congratulations. Sophie,Tommy's Midwife
By s mummy (not verified) on 29 May 2018 - 16:46
I done a clear blue on the 26-5-18 and says I'm 3+ weeks. I don't know the last period I had I just need more information. Can you help?
By Midwife @Tommys on 30 May 2018 - 16:11
Hi S Mummy
Without knowing the date of your last period, it is impossible to date your pregnancy. To do this accurately, you'll need to go for an ultrasound scan. There they will measure the fetus and give you a current gestation and estimated due date. Your GP can arrange this for you at your local hospital.
All the best
By carol (not verified) on 28 May 2018 - 16:15
hi,i had the last period between 24th to 26th march.i went for the test and found out that iam pregnant.how many weeks am i?
when is my due date?
By Midwife @Tommys on 29 May 2018 - 11:20
Using your LMP date of lets say 25th March 2018, you could be up to 9 weeks pregnant and your due date would be somewhere around 30th Dec 2018. When you go for your dating scan, they will give you an accurate gestation and due date based on the measurements of the growing baby.
By Jessica (not verified) on 25 May 2018 - 12:05
Hello, I suffered a miscarriage at 7 weeks in early March, I have had 1 period between and am now 7+2 weeks pregnant again. The fear of having another miscarriage again is awful, this time round I have had more severe symptoms, sore breasts, sickness, nausea, tiredness, I can’t remember having any apart from sore breasts last time, but the past couple of days they seem to have eased so much, my appetite is back, my breasts are fine, I’m not having half any much general achy pains anywhere. I’m not bleeding though, is it normal to have days when you have no symptoms?! X
By Midwife @Tommys on 25 May 2018 - 12:28
I am sorry to hear that you experienced a miscarriage previously, and pregnancy after a miscarriage is often a time filled with anxiety and worry. It is reassuring that you do not mention that you have any pain or bleeding. Pregnancy symptoms can come and go, and vary throughout the pregnancy and are different for everyone. Commonly they start to reduced towards the end of the first trimester. Having said that, it sounds like you have noted a sudden loss in symptoms, and given your history, I would suggest to call your GP to see if they can refer you to the early pregnancy unit for a review.
If you would like to talk further you can email us [email protected]
By anni (not verified) on 24 May 2018 - 15:37
Had sex 2days after my period, after two week began expirencing pregnancy signs as, tireness, nausea, feeling sleepy, and some few more which continued till a week
Making it 3weeks. Den on the forth week, i get some pains in my abdomen and suddenly everything stops, no more signs and no more pregnancy. No bleeding just some vigina white-slippry discharges and pains on my lower back and lower stomach and abit of fever. Its happen 3 times in 3 direct months
By Midwife @Tommys on 24 May 2018 - 16:20
It is difficult to know if you have been pregnant each time or if this is just changes that are occurring in your cycle. Without a pregnancy test we would know for sure. If you have been trying for a pregnancy for longer than a year then do going and see your GP for support. We also advised to be taking folic acid supplement if you are trying for a pregnancy.
Best wishes, Tommy's midwives
By Unknown (not verified) on 24 May 2018 - 08:05
I had sex on 1/26/18 and missed my period in February but had a period on 3/21 and missed my period again in may but got my last period on may 4th could I be pregnant?
By Midwife @Tommys on 24 May 2018 - 16:12
It is very difficult to know if you are pregnant, you will need to do a pregnancy test to be sure. If you are have intercourse with out protection there is always a chance of pregnancy.
By Lala (not verified) on 23 May 2018 - 09:44
I had my LP on the 17th in April and had sex on April 25th with a contraceptive (condom). I had a brown discharge from april 2-5 and gotten another brown discharge on april 10th. I was expecting my period on the 18th of may but I'm 5 days late now. Is it possible that Im pregnant?
By Midwife @Tommys on 24 May 2018 - 11:39
Hi Lala, Thank you for your comment.
As your period is 5 days late then we would suggest that you do a pregnancy test just to see if you are pregnant. No contraceptive is 100% and occasionally women can fall pregnant when using condoms so for this reason just take a pregnancy test to be sure. Hope this helps, take care, Tommy's Midwives x
By Lala (not verified) on 26 May 2018 - 14:14
Hello! Thank you for your response. I already tried pegnancy test and it shows a negative result. And as of now im already 8 days late. I feel so full,bloated and Im experiencing light cramps. I was thinking that maybe my irregularity just kick in , which happens rarely since I never tried having very late period just like this one. Im really anxious. Thanks
By Midwife @Tommys on 29 May 2018 - 11:23
It might be sensible to repeat the pregnancy test again if you are now 8 days late. Taking the pregnancy test any earlier than a week after your missed period may give you a false negative result.
If it is negative, then you should go to your GP to be reviewed and if they are concerned, then they may send you for a Gynae outpatient referral.
All the best
By Lindsay (not verified) on 22 May 2018 - 00:12
Hi there, I recently just found out I am pregnant but can't remember the last time I had my period. I want to say March 10th but can't be certain. I'm hardly showing any signs of being pregnant other than a hugely increased appetite. I'm not sure what my first steps should be or where to even begin. Any help or suggestions would be greatly appreciated. Thanks.
By Midwife @Tommys on 24 May 2018 - 09:39
Hi Lindsay, Thank you for your comment.
Congratulations on your pregnancy. If you are unsure of your dates then we would advice that you make an appointment to see your GP who will be able to send you for an early scan and then they will be able to measure the baby and calculate how many weeks pregnant you are. Make sure that you are taking your pregnancy vitamins and maintaining a health diet. Hope this helps, take care, Tommy's Midwives x
By Paige (not verified) on 20 May 2018 - 22:11
I had sex (on birth control) April 8th. I got sick with a throat infection the week of April 30th. And I also had a period during the first week of May during my inactive pills. I haven’t been feeling good and have a loss of appetite. I’m now bleeding again 2 weeks after my period. I did take an antibiotic called cefdinar between period and consistent spotting. Any ideas?
By Sandy (not verified) on 19 May 2018 - 18:16
Hi, I'm 8 weeks preggies & my bump is showing, as if I've passed my trimester. Could it be multiples?
I'm going for a scan at 12 weeks.
By Midwife @Tommys on 21 May 2018 - 15:08
Hi Sandy, Every woman is different and some women show earlier than others. It is possible that you may be carrying twins but you will have to wait until the scan to find out. Best wishes
By Sikuku (not verified) on 18 May 2018 - 20:21
hi, my LMP was 30/3/2028 at the moment am feeling weak, having a stomach pain on one side (right hand side) and also a time i feel am out of breath after a walk or standing for a long time, is there any problem and kindly confirm me my weeks of pregnancy as at the moment thanks.
By Midwife @Tommys on 21 May 2018 - 10:25
Hi Sikuku, I calculate you are 7 weeks plus 3 days today. If your stomach pains are severe or persistent you should be checked by a doctor or midwife to rule out an ectopic pregnancy. See our information about stomach pain. https://www.tommys.org/pregnancy-information/symptom-checker/stomach-pain-pregnancy
By Julie (not verified) on 17 May 2018 - 12:40
I had a normal period 11/02/18 My next period I had a strange period 08/03/18 I had one day of brown blood and the next day red blood but not alot followed by 2 more days of brown blood. I didn't have a period at all 02/04/18 I found out I was pregnant on the 5th of April clear blue pregnancy test said 2-3 and I tested again on the 9th it said 3+. I m now 10 weeks 3 days pregnant 17/05/18 I have my dating scan on 23/05/18. I don't know if these dates are right.
By Midwife @Tommys on 17 May 2018 - 14:50
Hi Julie, Thank you for your comment.
If you take the first day of your last period as the 08/03/18 then these dates sounds about right and puts you just over 10 weeks today. When you go for your dating scan they will be able to give you a more accurate date as it is easier to date a pregnancy within the first 12 weeks. Hope that this reassures you and if you have any further concerns then please email us on [email protected] Take Care, Tommy's Midwives x
By Sd2896 (not verified) on 14 May 2018 - 05:41
Lmp was 8th of april 18
Currently measuring 5 weeks and 1 day
As today was my first time at my GP, and had a blood test, returning tomorrow to my GP to do more testing for glucose fasting was just wondering how long i have to fast for?
Bit blury brain as i was trying to take in all the information i was given haha.
And also will my GP reffer me to a midwife or do myself and partner choose for ourselfs?
Thank you x
By Midwife @Tommys on 14 May 2018 - 12:04
Hi, Congratulations on your pregnancy. Just give your surgery a ring to ask about the blood test. It depends what test they are doing as to how long you should fast for. Most fasting blood glucose tests require you to fast for 8-10 hours.
You are able to choose your own care provider. The GP should be able to discuss this with you and will then send a referral. Alternatively you can self refer to a hospital of your choice.
By Patricia Ojonoma (not verified) on 12 May 2018 - 14:03
My LMP was 23/3/2018. How many weeks am I and when will be my EDD? I also noticed a coloured discharge (blood like) yesterday hope all is well with my baby. At what month should I start Antenatal?
By Midwife @Tommys on 14 May 2018 - 11:34
Hi Patricia, You would be 7+ weeks now and your due date is 30th December. Try to arrange to see your doctor as soon as possible.
By Betty (not verified) on 11 May 2018 - 22:39
The first day of my LMP was April 2 I took a pregnancy test at home it's positive, no mornings sickness no brown discharge I only feel crampe almost every day. Is it possible that I might be pregnant?
By Midwife @Tommys on 14 May 2018 - 11:31
Hello Betty, Yes, if your pregnancy test is positive you are pregnant. Please arrange to see your doctor when you can. Very glad that you have located our website and can read about having a safe and healthy pregnancy. Take care
By alayo (not verified) on 9 May 2018 - 20:34
lmp is 18th of february.how old is my pregnancy
By Midwife @Tommys on 10 May 2018 - 14:09
Using your LMP of 18th Feb, and presuming you have a cycle of around 28 days, the most pregnant you can be in 11-12 weeks.
Congratulations! If you need anymore help or advice, please do get in touch via email - [email protected]
By Roxana (not verified) on 9 May 2018 - 09:55
I am 31 yrs old and i think I am 5 weeks pregnant. I worried that I have not started folic acid before being pregnant and have started only a week ago. i have vit b12 deficiency and not on any kind of pills. should i take more supplements of folic acid ? i am concerned about neural defects and its my first pregnancy.
By Midwife @Tommys on 10 May 2018 - 14:13
Taking folic acid and pregnancy vitamins both pre- pregnancy and in early pregnancy is the ideal. So as you are already doing this, you do not need to be concerned. Please see the page below for more in depth information from another of our webpages...
Look after yourself and feel free to contact us by phone or email if you need any further advice or assistance.
By Bela (not verified) on 8 May 2018 - 12:24
Hi, my last period was 20th March and I had intercourse on the 6th of April, I'm about 6 weeks pregnant and already heard my baby's heart beat, I'm a little worried however because I sometimes experience minor twinges, period like cramps, and uncomfortable, I also noticed that I have a very minor brown like discharge when i wipe after peeing, my pee is normal color but this discharge worries me a bit my appointment is on the 29th of May, but is there any cause for concern? Sometimes I get so paranoid of a miscarriage
By Midwife @Tommys on 10 May 2018 - 14:26
It is normal for you to feel anxious in your first pregnancy. And it is also sensible to be aware of your symptoms, which you are- and this is great.
Any abdominal pain or cramps or vaginal bleeding/spotting, at any gestation of pregnancy, ideally should be reviewed to ensure that everything is ok. You can go to your GP who can refer you to an early pregnancy assessment unit before 12 weeks gestation. If you develop severe abdo pain, or the bleeding were to be very heavy, then you must go straight to a&e.
It is always best to get these things checked out, mostly for your own peace of mind.
Please feel free to get in touch via email next time [email protected]
All the best
Sophie Tommy's Midwife
By Bailey (not verified) on 3 May 2018 - 20:44
Hello! I had unprotected sex on April 12. I was on birth control but only for a short amount of time (a couple weeks) I started my period April 1st and ended April 10 (it was longer because of my new birth control). I have never tracked my period and I didn't try to have a baby. I toke a test about 2 weeks after sex and came back negative. It is May 3rd today and I still haven't gotten my period, what should I do?
By Midwife @Tommys on 4 May 2018 - 09:52
HI - Thank you for your message.
You haven't shared how regular your periods normally are - bur if your period is late, then it is important you take another pregnancy test. The previous test you took 2 weeks after you has unprotected sex may have been to early. If you are worried or unsure, please contact your GP for further advice.