Pregnancy calendar

weeks pregnant

4 weeks pregnant - what to expect

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.

4 weeks infographic.

Each week we’ll offer advice on how to cope with pregnancy symptoms (the good, the bad and the ugly), and take you through the practical bits, like booking appointments.

Before week 4

If your periods are usually regular, conception is likely to happen in the middle of weeks one to four. You are very unlikely to know you're pregnant at this stage.

Pregnancies are measured from the first day of your last period rather than the day you actually conceived your baby. This is because it's not always easy to be sure of the exact date you became pregnant.

“I spent the entire week my period was due running to the loo, just to double check I didn’t have my period. My boobs felt tender - but that can be a sign of PMT too. I took an early test in the end and couldn’t believe it when it showed positive.” Ayida, mum of one

Although a fertilised egg may have implanted in your womb just two weeks ago, if the first day of your last period was four weeks ago, you are officially four weeks pregnant! This may seem odd if you think you can definitely date the pregnancy more recently.

Get weekly updates on your baby's development from our expert midwives straight to your inbox.

What does my baby look like?

The tiny person inside you is the size of a poppy seed. A little dot, measuring about 2mm.

They may be miniscule but big things are happening! The fertilised egg has snuggled into the side of your womb. It divides into layers of cells that will eventually become different parts of your baby’s body.

Your baby’s nervous system and heart are developing. Amazingly your tiny dot already has some of its own blood vessels and blood is starting to circulate. A string of these blood vessels connects you to your baby. This will eventually become the umbilical cord.

Right now, your poppy seed is known as an embryo. They get their energy and nourishment from a yolk sac (until the placenta takes over in a few weeks). Your baby is surrounded by amniotic fluid within the amniotic sac, providing a comfy cushion for them throughout your pregnancy.

Your symptoms - what to expect

Noticed some light spotting?

You might notice some very light bleeding, or ‘spotting’, known as implantation bleeding. This can be caused by your little seed burrowing into the lining of your womb. It often happens around the time your period would have been due and is relatively common.

You may also have some period-like cramping in these early weeks.

If you notice any bleeding at any stage of your pregnancy, though, it's important to get it checked out by your doctor or midwife.

Sore boobs

This week, a surge in progesterone can start to make your boobs feel tender, heavy and sore - a bit like how they might feel before your period.

Remarkably, these are pregnancy hormones already preparing your body to produce milk. This tenderness usually eases off by the end of the first trimester.

Find out how to deal with first trimester pregnancy complaints.

Actions to take

Say bye-bye to booze

It’s time to quit cigarettes and wave wine ’o’ clock goodbye for a few months.

Here’s our guide to avoiding alcohol during pregnancy.

Find out more about the effects of smoking in pregnancy.

And if you’re still struggling to stop smoking, these ten steps towards quitting could help.

If you use street or recreational drugs, stop or ask your doctor for advice on stopping safely.

STIs

Sexually transmitted infections (STIs) such as chlamydia, gonorrhoea, syphilis and genital herpes can affect your baby's health during pregnancy or birth.

If you think you or your partner might have an STI, go for a check-up as soon as you can. Your doctor or midwife can tell you where you can find your nearest sexual health clinic.

Don't worry, nobody will judge you and it's important to be checked as soon as possible.

Start taking your supplements

There are two vitamins that are very important in pregnancy and that you can take as supplements: Folic acid and vitamin D.

Folic acid (folate) is naturally present in leafy vegetables, fruits and berries, beans and wholegrain products - but keep taking folic acid supplements too, until at least week 12.

Folic acid helps in the formation of your baby's nervous system and reduces the risk of spina bifida, which is where the baby's spine doesn't close up properly.

You should take:

  • 10 micrograms of vitamin D each day throughout your pregnancy and if you breastfeed
  • 400 micrograms of folic acid each day – you should take this from before you are pregnant until you are 12 weeks pregnant

Find out more about important supplements in pregnancy.

Book a GP appointment to let them know your news

Once you know you’re pregnant, make an appointment to see your doctor or a midwife to get any advice you need and to be booked in for your pregnancy care appointments.

This is an important time to talk about any health issues you have to make sure your pregnancy goes well. Tell your doctor about any medication you may be on, especially long-term medicines for conditions related to diabetes, hormone therapy, heart problems and so on.

Find out what questions you'll be asked at the booking appointment.

If you have an existing mental health problem

If you have a pre-existing mental health condition and take medication, tell your doctor and the person who prescribed the medication that you’re pregnant as soon as possible.

They will talk to you about whether your medication is safe in pregnancy or whether you should consider a different treatment.

Find out more about your mental wellbeing in pregnancy.

What are my chances of miscarrying?

It’s a sad thing to think about, but up to one in five pregnancies will end in miscarriage in the first three months.

If you do experience light bleeding, spotting or stomach pains, this doesn't mean you are going to miscarry. However, you should always speak to your doctor or midwife and ask for advice.

Find out when you should contact your midwife immediately.

Sources

1. You and your baby at 0–8 weeks pregnant, NHS Choices: http://www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-weeks-4-5-6-7-8.aspx#close  [accessed 7 May 2015] (last reviewed: 9 February 2015; next review due: 9 February 2017)

2. You and your baby at 0–8 weeks pregnant, NHS Choices: http://www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-weeks-4-5-6-7-8.aspx [accessed 28 February 2015] (last reviewed: 9 February 2015; next review due: 9 February 2017)

3. You and your baby at 0–8 weeks pregnant, NHS Choices: http://www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-weeks-4-5-6-7-8.aspx [accessed 28 February 2015] (last reviewed: 9 February 2015; next review due: 9 February 2017)

4. http://www.nhs.uk/conditions/pregnancy-and-baby/pages/vaginal-bleeding-pregnant.aspx 

5. Signs and symptoms of pregnancy http://www.nhs.uk/Conditions/pregnancy-and-baby/pages/signs-and-symptoms-pregnancy.aspx

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Last reviewed on April 1st, 2015. Next review date April 1st, 2018.

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Comments

  • By Anonymous (not verified) on 14 Sep 2017 - 12:11

    Hiya I done a clear blue digital test 3 days ago and said I'm 1-2 weeks pregnant done another one today and came up not pregnant wat one do I believe

  • By Midwife @Tommys on 14 Sep 2017 - 15:11

    Hi, Thank you for your comment.
    As you have had a positive test then we would assume that you are pregnant. It may be advisable to do a test first thing in the morning when you wake up as this is the best time to test when the urine is at its strongest. See what result you get and if it is still negative then see your GP who will be able to do a blood test to check for the pregnancy hormone. This is the same hormone that is picked up in the urine but it appears stronger in the blood. Hope this helps. Tommy's Midwives x

  • By Anonymous (not verified) on 8 Sep 2017 - 19:40

    How would I know the baby's father while I was sleeping with two mens

  • By Midwife @Tommys on 11 Sep 2017 - 10:52

    Hi - if you are unsure which partner maybe the baby's farther, a DNA test is the only way of finding out after the baby is born.

  • By Anonymous (not verified) on 31 Jul 2017 - 13:20

    Hi I'm 44 and suffered a blighted ovum earlier this year. I've now found out I'm pregnant again luckily. What are the chances of there being a problem again? My last period was 4/7/17 .. so I think I'm 4 weeks. When would you advise I have my first scan? Many thanks

  • By Midwife @Tommys on 31 Jul 2017 - 14:41

    Hi. The first scan is usually done between 11 and 14 weeks. I would suggest that you see your GP first and arrange for a referral to be sent to the hospital of your choice within your home area. In the mean time ensure that you are in optimal health and remember to take folic acid. All the information is on our site. Best wishes x

  • By Anonymous (not verified) on 9 Jul 2017 - 06:54

    I am 4 weeks preggers and I usually really go for it at zumba twice a week, plus a gym and swim session. Can I keep going? Do I have to go easy on myself during these sessions?

  • By Midwife @Tommys on 10 Jul 2017 - 12:24

    Hi and congratulations on your pregnancy. Its great that you want to continue with exercise and all the benefits it will give you. Our advice for the first trimester is to continue as usual but to avoid very hot conditions and contact sports. We have a great link to help you decide what is best for you. Hope it helps. https://www.tommys.org/sites/default/files/Exercise%20infographic.pdf

  • By Anonymous (not verified) on 24 Jun 2017 - 01:00

    hi first day of last period was 25th may for 7 days 28day cycle
    working out due date calculator online says im 4 weeks 1 day pregnant do i add 2 weeks on making me 6 weeks 1 day??
    hope this make sense
    thanks

  • By Midwife @Tommys on 26 Jun 2017 - 10:45

    No there is no reason to add 2 weeks. The pregnancy calculator starts from the beginning of your cycle. Your scan at 12 weeks may alter your dates by a few days. BW Tommy's midwives

  • By Anonymous (not verified) on 18 Jun 2017 - 23:01

    I have missed my period and on the very next I have checked with pregnancy test kit and I have found I am pregnant it was positive and I really want this baby as well as I am trying for another baby for more than a year but I have to carry my elder son as he is not feeling well and I start having very bed back pain straight after that so I am worrying I don't miscarry my baby because I am carrying elder one who is 12 kg in weight plz advise me

  • By Midwife @Tommys on 19 Jun 2017 - 10:13

    Hi and congratulations on your pregnancy. Please try not to worry. There is no evidence that carrying a toddler causes miscarriage. Remember though to squat and lift using your legs rather than your lower back. You can also start to encourage your child to walk more or to climb onto your knee instead of being lifted. This will help you to prepare him for the new baby. Other suggestions include keeping yourself as active as possible during your pregnancy and if you are concerned about an injury you can see a physiotherapist or an osteopath. Best wishes

  • By Anonymous (not verified) on 14 Jun 2017 - 00:29

    Missed period and 4 days late some advice plz

  • By Midwife @Tommys on 14 Jun 2017 - 10:45

    Hi, the only way to know is to buy a pregnancy test today, follow the instructions and you will get a result in minutes.
    Always here to talk on 0800 0147 800.
    Anna_ Tommy's Midwife

  • By Midwife @Tommys on 14 Jun 2017 - 10:46

    Hi, the only way to know is to buy a pregnancy test today, follow the instructions and you will get a result in minutes.
    Always here to talk on 0800 0147 800.
    Anna_ Tommy's Midwife

  • By Anonymous (not verified) on 3 May 2017 - 10:56

    Hello! I had a miscarriage back in January (my first pregnancy). My husband and I haven't really been trying but were thinking about it. Would it be too early to try again being that I just miscarried 4 months ago? Also, I started my period on April 23, 2017; when should I be ovulating. Should we start having sex everyday until I start my period again?

  • By Midwife @Tommys on 3 May 2017 - 13:14

    Hi Brooke
    I am really sorry to hear about your miscarriage in January. That must have been very hard for you and your partner.
    Most healthcare professionals may suggest you wait until you have a normal period before you start trying again. The reason is your first menstrual period may be shorter or longer than normal, which could make it difficult to date the next pregnancy and cause you some unnecessary anxiety..
    In some instances - such as molar or ectopic pregnancy, if you have an infection, or a late miscarriage - you should talk to your GP before you start trying again, who may advise you to wait.
    If you’re being investigated for recurrent miscarriage, it’s a good idea to have all the facts to hand before trying again. You can use our Ovulation calender to track when your most fertile days are - see the link below...
    https://www.tommys.org/pregnancy-information/getting-pregnant/ovulation-calculator
    Please do take good care of yourself!

  • By Anonymous (not verified) on 18 Apr 2017 - 10:26

    hi i found out with a clear blue digital i'm 1-2 which is 3-4 weeks i am scared that its wrong and i'm not pregnant at all

  • By Anonymous (not verified) on 8 Apr 2017 - 00:37

    Hi. I had a miscarriage around 10th of march I had unprotected sex 2 weeks after that and now tested positive for pregnancy. Do I still count the first day of my miscarriage bleed as my cycle to understand how far gone I am? On 3/4/17 I did a test and it said negative tested again the next day 4/4/17 and tested positive. Please can you shed any light. Thank you.

  • By Midwife @Tommys on 10 Apr 2017 - 09:30

    It might be a little difficult to be able to "date" your pregnancy as you did not have a period in between the miscarriage and this pregnancy, which means you wont have a last menstrual period date to count from to work it out.
    It would be worth going to your GP, getting them to refer you to your local early pregnancy assessment unit, and being booked in for an early scan to try to estimate your gestation and estimated due date. Take care of yourself and congratulations!!!!

  • By Anonymous (not verified) on 6 Apr 2017 - 10:30

    hi, I saw my period last on the 13/2/2017. I tested with home pregance and it appeared positive pls how do I know how many weeks that I am now

  • By Midwife @Tommys on 6 Apr 2017 - 13:10

    Hi, Assuming that you have a regular cycle around 28 days, if your LMP (last menstrual period) started on 13/2 17, you would be between 7 and 8 weeks today. I would advise that you arrange to see your GP for advice and referral to a maternity unit. Good to see that you have found our information here at Tommy's with advice on all aspects of your pregnancy.

  • By Anonymous (not verified) on 1 Apr 2017 - 15:27

    Hi, i have found out @ 3weeks 4 days i am pregnant i know this is early i used a digital it said 1-2 weeks my hcg level on that day was 89 but ive to retest again this monday... everyone is telling me 89 is low but to me not many people even no at 3weeks 4 days and ur hcg has to start somewhere. Im now really in a panic but i read for 3-4 weeks ur levels shld be 5-50 so mine are actually good. I had a previous molar pregnancy then a misscarriage so i am a bit anxious :( any advice would be much appreciated as i feel i have already written myself off. :( x

  • By Midwife @Tommys on 3 Apr 2017 - 09:42

    Hi Sparkel2010. It sounds like you are very anxious, but that is understandable after you've experienced both a molar pregnancy, followed by a miscarriage. But please try not to worry too much at this stage, it sounds as if things are progressing normal for this stage of pregnancy for you.
    Typically, the hCG levels will double every 72 hours.
    At 3 weeks from LMP: 5 – 50 mIU/ml
    At 4 weeks from LMP: 5 – 426 mIU/ml. These numbers are just a guideline and every woman’s level of hCG can rise differently. It is not necessarily the level that matters, but rather the change in the level. If you are concerned, then you can visit your local early pregnancy assessment unit, as i presume you may have already had contact with them in your previous history. Please take good care of yourself and feel free to contact us via phone or email if you wish to ask anything else, in a more private way.

  • By Anonymous (not verified) on 29 Mar 2017 - 11:41

    Hello, I tested positive on a home pregnancy test yesterday, I want to feel delighted but in the past eleven months I've had two miscarriages. Yesterday I was only on day 32 since the first day of my last period but I just felt like I should take a test. I was thinking my period was late as my last period started on 24th Feb although I realise Feb is a short month. I don't know how long my cycle is as my last period was the first one after my miscarriage in January. Would I be testing positive for any other reason than I'm pregnant?! It just seems very early. (I have tested negative since my miscarriage by the way.) Thank you

  • By Midwife @Tommys on 29 Mar 2017 - 13:07

    Hi thank you for your message. After a miscarriage your menstrual cycle can alter and I can only imagine how guarded you are to be 'delighted' after suffering two miscarriages in the past 11 months. You had a negative pregnancy test after your last miscarriage and have been trying for a baby since. A positive pregnancy test means you're pregnant!
    I know that you will be feeling a whole range of emotions over the coming months and it will be so hard to dare to hope. Please don't suffer in silence we are hear to listen and support you if you need us. You can contact us on 0800 0147 800 weekdays 9-5 pm.
    Warmest wishes
    Tommy's Midwives

  • By Anonymous (not verified) on 29 Mar 2017 - 13:19

    Thank you for responding. I have been through all the things I can see online about false positives (being on medication, out of date test etc) but nothing applies so I am very hopeful but it took almost 7 months to conceive after the first miscarriage (for it to sadly happen again) so I can't believe we'd be blessed again so soon after the heartache. Your professional input is very much appreciated. And I may well make contact regarding my miscarriages as I'm finding them really difficult, definitely the absolute worst events in my life and my family are not good at talking. Thanks again, inside I can't stop smiling.

  • By Midwife @Tommys on 29 Mar 2017 - 13:42

    Hi, you are so welcome. Keep smiling, we're smiling with you! We would love to hear from you about anything that is worrying you and to support you on this journey.

    Tommy's Midwives

  • By Anonymous (not verified) on 14 Mar 2017 - 02:29

    Great possibilities Im pregnant. Miss one period. Im having yellow discharged. .what does it mean

  • By Midwife @Tommys on 14 Mar 2017 - 09:11

    Thank you for your comment.
    Extra discharge can be a normal and reassuring symptom of pregnancy.
    However if the discharge is causing itching, discomfort or has an offensive smell please contact your GP who can advise and treat for any infections.

  • By Midwife @Tommys on 14 Mar 2017 - 09:14

    Thank you for your comment.
    Extra discharge can be a normal and reassuring symptom of pregnancy.
    However if the discharge is causing itching, discomfort or has an offensive smell please contact your GP who can advise and treat for any infections.

  • By Anonymous (not verified) on 28 Feb 2017 - 02:23

    Hi. My last period date was 1.2.17... Usually for last 3months my period cycle was 23days...I take duphaston10 mg for last 3months..1tab in a day.. Now the is 28.2.17... But I don't have period ..am trying to conceive for few months..its can pregnancy...pls help me..

  • By Midwife @Tommys on 2 Mar 2017 - 15:36

    Hi
    Thank you for your comment.
    If your period is late, you can do a pregnancy test. If you are pregnant, then its important to seek advice from your GP and getting referred for antenatal care. Make sure you are taking care of yourself with healthy diet and taking folic acid tablets

    I have added some links that you may find helpful

    https://www.tommys.org/pregnancy-information/getting-pregnant/am-i-pregnant
    https://www.tommys.org/pregnancy-information/getting-pregnant/top-tips-conception

    Please contact us on Tommy's Pregnancy LIne -0800 0147 800 if you need any further advice

  • By Midwife @Tommys on 2 Mar 2017 - 15:36

    Hi
    Thank you for your comment.
    If your period is late, you can do a pregnancy test. If you are pregnant, then its important to seek advice from your GP and getting referred for antenatal care. Make sure you are taking care of yourself with healthy diet and taking folic acid tablets

    I have added some links that you may find helpful

    https://www.tommys.org/pregnancy-information/getting-pregnant/am-i-pregnant
    https://www.tommys.org/pregnancy-information/getting-pregnant/top-tips-conception

    Please contact us on Tommy's Pregnancy LIne -0800 0147 800 if you need any further advice

  • By Anonymous (not verified) on 15 Jan 2017 - 17:13

    how do I know how long I av been pregnant without going for scan cos i missed my period since two months ago

  • By Midwife @Tommys on 16 Jan 2017 - 09:28

    Hi there. You can work it out by pinpointing the first day of your last menstrual period. For ease, you can use a pregnancy calculator like the one i have posted for you below.

    http://www.nhs.uk/conditions/pregnancy-and-baby/pages/due-date-calculator.aspx

  • By Anonymous (not verified) on 10 Jan 2017 - 13:25

    my due period was on 4 January 2017 then Its late by 2 days. its came on 6 this month could I be pregnant

  • By Midwife @Tommys on 10 Jan 2017 - 13:37

    It is not unusual for period dates to vary by a few days and for your cycle to be a little irregular. If you have had your period this month, a pregnancy is extremely unlikely. Best wishes

  • By Anonymous (not verified) on 27 Dec 2016 - 09:22

    On the 27th of November my boyfriend came in me after that I started bleeding and I was bleeding heavily with clots for about 2 weeks. We recently had sex again this weekend and he came in me both days. I'm now experiencing clear discharge with a little blood but i started bleeding a little more.
    What's going on ? Am I pregnant or ?

  • By Midwife @Tommys on 6 Jan 2017 - 09:19

    Hi, Sorry to hear you are experiencing such confusing and difficult symptoms. I would advise for you to do a pregnancy test if you have not done so already. If this is positive and you are bleeding then I would advise to make contact with your GP for a review. If the pregnancy test is negative and the bleeding has stopped and you feel well then rest up and just monitor how you are feeling. If the bleeding continues or you feel unwell or have other symptoms then again see your GP if you are sure it is not your period.

  • By Midwife @Tommys on 30 Nov 2016 - 10:07

    Hi,
    If your period is late you can do a pregnancy test. The brown discharge you mention may be implantation bleeding. The breast tenderness, cramps and backache may be a pre menstrual symptoms or early pregnancy but you wont know until you take a pregnancy test. Please feel free to call us here at Tommy's 0800 0147 800 anytime weekdays 9-5 pm.
    Tommy's Midwives

  • By Anonymous (not verified) on 30 Nov 2016 - 09:35

    few week I've been discharging brownish my breast sore, stomach cramp for a week n backpain now I've missed my period in 2days n now am discharging white creamy

    help me pls

  • By Anonymous (not verified) on 29 Nov 2016 - 06:06

    4 weeks i havent my meanstration and i feel something different in my stomoch, did im pregnant?

  • By Midwife @Tommys on 29 Nov 2016 - 09:40

    If you have missed the first day of your menstrual period then you can take a pregnancy test. If you get a positive test result on the first day of your missed period, it's probably about two weeks since you conceived. Please feel free to contact one of our Midwives for a chat on our helpline 0800 0147 800 if you want more advice. A Midwife is always here from 9am till 5pm, Monday to Friday

  • By Anonymous (not verified) on 19 Oct 2016 - 01:43

    I am four pregnant when start feel movement

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