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
We also have lots of useful tips for coping with everyday pregnancy niggles. It’s common for women to experience symptoms such as morning sickness, cramp and indigestion during the first trimester. But try not to worry, these symptoms mean that your baby is growing strong and healthy!
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 9 Nov 2018 - 15:56
It is possible that you did become pregnant during this time, everyone experiences pregnancy symptoms differently and ovulate at different times, that is why your period dates are used to estimate how many weeks you are until you have your scan.
By wilma (not verified) on 5 Nov 2018 - 12:09
I last seen my periods between 25 and 27 September. How many weeks am i?
By Midwife @Tommys on 5 Nov 2018 - 16:07
You would be no more than 6 weeks exactly today if your last period started on the 25th Sept. You should go to your GP to book your first scan and your booking appointment with the midwife. Congratulations. Tommy's Midwife
By Mary (not verified) on 2 Nov 2018 - 08:10
My last period was around 20th/21st September. Had unprotected sex, (but didn’t even ejaculate at all) on 27th September. It’s now 2nd November and I haven’t had my period yet. I’ve got a slight blocked nose, headaches and feeling extremely groggy in the mornings, I feel sick during the day, but I don’t actually vomit or anything, breasts feel sensitive and tender and been needing to go toilet, more Than Normal. I haven’t had a pregnancy test, because I’m just hoping it’s PMS but my period has been consistent every month!
By Midwife @Tommys on 5 Nov 2018 - 11:59
You will need to do a pregnancy test to know for sure. It is best to test 7 days after your period was due. See below for more tips when taking a pregnancy test to get the most accurate result.
All the best
By Temmygold (not verified) on 29 Oct 2018 - 17:29
I saw my period last on the 2nd of Oct, was expecting the next one. I had some on and off cramps and a missed period so I did a urine test at home, it came out positive so I went to the hospital to confirm and it came out positive..
What is the next thing for me to do presently?
By Midwife @Tommys on 2 Nov 2018 - 09:57
When you find out you are pregnant, if you are not already, it is really important that you start taking a folic acid and vitamin D supplement. Then when you are ready, you can either contact your GP for a referral to maternity services, or most hospitals now you can also self refer online on the hospital's website. Once this referral has been processed, then you be well be sent an appointment for your first booking appointment with the midwife, then they will make a plan with you then for your antenatal care.
By Aminat (not verified) on 29 Oct 2018 - 15:08
My lmp was September, 18 doctor confirmed am pregnant am one wk pregnant since den am always feeling discomfort in my belly n on liquid paraffin due to my history up till now is it save
By Midwife @Tommys on 2 Nov 2018 - 09:51
Liquid paraffin can be prescribed in pregnancy to soften your stools and help with constipation, it is also really important to make sure that you are drinking enough water and having lots of fruit, vegetables and high fibre foods, together with some regular exercise. If you are constipated then this can cause some discomfort, however if you are in pain or this is on going then do go back to your doctor.
By Zari (not verified) on 22 Oct 2018 - 17:00
Hi my LMP was on 20/21 of September 2018. I have a 28-30 day cycle. depending on the flow of my periods. Today the 22nd October 2018 I found out that I’m pregnant. My Best friend and I had already make plans to travel to Singapore and Bali from the 4-12 November 2018. Is it safe to travel abroad from India. I have no symptoms of morning sickness or feeling of tiredness or nausea so far and I travel by road from home to work on a weekly basis for six hours and did the same today. I sometimes have to travel for 8 hours depending on my work. Pls tell me whether it is safe to travel? I am a 36 year old woman.
By Midwife @Tommys on 23 Oct 2018 - 14:13
Yes, it is safe to travel in pregnancy as long as you are healthy. Be cautious of drinking local water if you are abroad as you are not used to it. We recommend bottled water instead. We have good travel advice here https://www.tommys.org/pregnancy-information/im-pregnant/your-questions-answered/can-i-fly-pregnancy
By Kate S (not verified) on 11 Oct 2018 - 22:45
I am 5 weeks pregnant and today have sharp stabbing pain on my left side that comes and goes. No blood but worried something is going wrong. What should I do?
By Midwife @Tommys on 15 Oct 2018 - 12:29
Hi, I hope that your pain has settled down now. Sorry not to be able to respond earlier. If you are still concerned please see your GP or if you are in serious pain you can go to A/E.
By Elsie (not verified) on 11 Oct 2018 - 19:01
my last period was between 20 and 25
By Midwife @Tommys on 12 Oct 2018 - 16:56
According to your dates, your baby will be due about the 28th of November, however you should have been given a due date when you had a scan during the first trimester of your pregnancy.
By Rachel (not verified) on 10 Oct 2018 - 20:31
I don’t remember the last date of my period, i have been irregular for a while due to the pill.
When I go to my first midwive appointment will they give me a scan to see how far along I am because I’m unsure of the date or will they wait & book me in for another at a later date?
By Midwife @Tommys on 11 Oct 2018 - 12:29
Hi Rachel, Thank you for your comment.
If you are unsure of your dates then you don't have to wait to book with the midwife, the GP can refer you for an early dating scan to give you an accurate idea of how many weeks you are. Please call your GP to arrange this. Take Care, Tommy's Midwives x
By Shanice (not verified) on 4 Oct 2018 - 04:40
Hi, I'm 7 weeks pregnant and I'm wondering in what order should I start planning things? I just don't want time to start going fast & I'm not prepared. Besides going to the doctor, when should I start buying baby stuff, saving up and thinking of baby names, ect??
By Midwife @Tommys on 8 Oct 2018 - 14:45
Hi Shanice, Why not follow our pregnancy guide week by week. This should cover all your queries at just about the right time. Saving up of course starts now! and you should see your doctor straight away- or as soon as you get an appointment, but there is no rush to buy anything yet. Take care
By Dionna (not verified) on 28 Sep 2018 - 15:20
I’m 11 weeks pregnant and I can say I only had 2 or 3 days out of my pregnancy no sickness but ever since I found out at 6 weeks I been SICK sore boobs tired and also throwing up mornings and nights ... is this normal I actually don’t feel so
By Midwife @Tommys on 1 Oct 2018 - 14:27
Hi Dionna, Unfortunately this is completely normal. We understand how difficult it can be and for most women this begins to resolve around 12-14 weeks when they start to feel much better. Hope it does for you too. Best wishes
By Dora (not verified) on 28 Sep 2018 - 14:56
I’ve had my last period between 11-14 of aug. i missed my period that supposed to be on the 10th of sept, and afterwards i was keep doing doing pregnancy tests but all said neg, and on the 14th day of missed period (25th of sept) :) i got 2 lines on my test, when i was just about to give up. I am so happy and thankful, and i would like to ask how many weeks pregnant I am? It might have happened when my period was on due?!
By Midwife @Tommys on 1 Oct 2018 - 14:32
Really pleased for you Dora and hope that you have a happy and healthy pregnancy. I can't be sure about your dates if your periods are irregular, but the best way to confirm is to have an early pregnancy scan.
If you were doing regular pregnancy tests and first positive on 25th Sept I would suspect that you would be 9 weeks now. Take care
By Peace (not verified) on 27 Sep 2018 - 13:51
My last period was 17/08/18,a week ago I was confused pregnant, please how many weeks am I now?
By Midwife @Tommys on 27 Sep 2018 - 15:30
Hi Peace, Thank you for your comment.
If your LMP was on the 17th august then you should be around 6 weeks pregnant. Hope this helps, take care, Tommy's Midwives x
By Anonymous (not verified) on 27 Sep 2018 - 13:02
My partner n I had unprotected sex and the last time I seen my period was July 28, 2018. How many weeks am I and I'm afraid to take a pregnancy test. What should I do?
By Midwife @Tommys on 27 Sep 2018 - 15:06
Hi, Thank you for your comment.
If you are pregnant then you should be around 8-9 weeks pregnant. It would be advisable to do a pregnancy test to see if you are pregnant and then see you GP for further advice. Hope this helps, take care, Tommy's Midwives x
By Lauren (not verified) on 27 Sep 2018 - 07:34
Mykast period was the 12th of august, i did 3 tests a couple of days after and they were all positive. How far gone am i ?
By Midwife @Tommys on 27 Sep 2018 - 15:20
Hi Lauren, Thank you for your comment.
If your LMP was the 12th August then you are around 6-7 weeks pregnant. Hope this helps, take care, Tommy's Midwives x
By Parvin (not verified) on 19 Sep 2018 - 12:33
Hi I started my period last month 15th August since then I haven't started my period I did have unprotected sex with my husband few time and do pregnancy test it still shows negitive I contact my gp and they said to wait but I did have few miscarriage and ectopic pregnancy in the past and was with the hospital miscarriage specialist but no longer with them they did say I have chance to be pregnant and now I am not starting my period still shows negitive my body is changing too. So what do i do now. Thank you
By Midwife @Tommys on 21 Sep 2018 - 11:25
Hi Parvin, If you are planning a pregnancy, what about trying our new pregnancy tool. https://www.tommys.org/pregnancy-information/planning-pregnancy/planning-for-pregnancy-tool
This is a simple way to see if there are any lifestyle changes you could make to help you to conceive and maintain a healthy pregnancy.
If you have repeated negative pregnancy tests it is extremely unlikely that you are pregnant at this time although I agree with your GP that it is still very early and if you ovulated late your period may still come any day. Take care.
By Anonymous (not verified) on 19 Sep 2018 - 04:48
Every app asks when was the last menstrual cycle, honestly I'm too sure, the day of intercourse was July 28th. How am I supposed to calculate due date?
By Midwife @Tommys on 20 Sep 2018 - 15:04
Hi Thank you for your comment.
The app should be asking for the first date of your last period, so this should be around 14 days before ovulation. If you are unsure of your dates then we would suggest that you see your GP who can refer you for a dating scan to see how many weeks your are. Hope this helps, Tommy's Midwives x
By Pau (not verified) on 18 Sep 2018 - 15:10
Would like to ask on August 17, 2018 my partner and i didnt have sex but just fooled around he didnt came inside me and just came near my right leg and nearly in my vagina. After that I had my heavy period - 6 days on august 21,2018. My next period should be today, Sept 18,2018 but didnt have it, my boobs are sore and I have cramps and lower back pains, I tried pregnancy test 1 day before my period it was negative, but today been waiting for my period to come but it didnt am I pregnant?
By Midwife @Tommys on 20 Sep 2018 - 14:18
Hi Pau, Thank you for your comment.
It is unlikely that you are pregnant as you had a heavy period after this incident happened and then you have had negative pregnancy tests. It sounds like your period is a little late this cycle. If you are still worried and your period doesn't come then take another pregnancy test and if it is still negative please see your GP who can do a blood test to check for the pregnancy hormone. Take Care Tommy's Midwives x
By Carol (not verified) on 18 Sep 2018 - 09:56
LMP was on 24,25,26 march.how many weeks am i?
By Midwife @Tommys on 20 Sep 2018 - 14:07
Hi Carol, Thank you for your comment.
If your LMP was the 24th March then you should be around 26 weeks now. If you have any concerns then please contact your GP or midwife who will be able to advice your further. Take Care, Tommy's Midwives x
By Melissa (not verified) on 13 Sep 2018 - 21:37
My last period was 2nd August 2018 and I had a positive pregnancy test 2 weeks ago. I have had symptoms on and off, sore boobs, cramps, pulling sensation, stitch feeling. I am nervous when the pains are there that things are going wrong but then when they stop I get nervous until they start again. Is that all normal, should I be feeling things on and off? Thanks x
By Midwife @Tommys on 14 Sep 2018 - 11:47
It is very normal for symptoms to vary, they can be different for each woman, each pregnancy and throughout the pregnancy. Feeling sore boobs and having some mild cramps are very common early pregnancy symptoms. If you find that the cramps are painful or if you have any bleeding then I would advise for you to see your GP just to make sure everything is ok with the pregnancy.
By brittany (not verified) on 11 Sep 2018 - 01:30
help, I'm pregnant and I don't know how to tell the father, I'm worried he'll leave me. I have no parents or family so im totally on my own. my bank account is dry to I cant afford health services. What do I do?
By Midwife @Tommys on 12 Sep 2018 - 15:05
This is a public website. Maternity care is free via the NHS in the UK and benefits are available if you need financial support.
Please can you contact Tommy's Pregnancy Line on 0800 0147 800 or email [email protected] with more information about your situation so that we can give you more personal advice and support.
By Dgold (not verified) on 6 Sep 2018 - 12:18
The last day of my period was July 21 2018. I just took a pregnancy test a week ago and it was positive. How many weeks am I?
By Midwife @Tommys on 11 Sep 2018 - 15:06
I have calculated that you are 7 weeks and 3 days today (11/09/18)-the baby's due date is 27/04/2019.
Please contact your GP or local maternity unit so that you be referred to them and start your antenatal care as soon as possible
By Jazmin (not verified) on 6 Sep 2018 - 05:09
I had light spottings a few weeks ago followed by cramps, headache, dizziness, constipation, bloating and fatigue. I did a pregnancy test more than once and they were all negative. What should i do ? I am worried.
By Midwife @Tommys on 11 Sep 2018 - 14:59
I would advise that you discuss your symptoms with your GP if you are still concerned-these symptoms could be due to several causes.
By thembi (not verified) on 4 Sep 2018 - 21:19
i go for 24 menstrual cycle and yet since ive been trying to get pregnant but no luck i wanna know when would i try again ..please Help
By Midwife @Tommys on 11 Sep 2018 - 10:33
Thank you for you comment.
Your cycle starts on the first day of your period and continues up to the first day of your next period.
Conception occurs around the time that you ovulate-this is usually 10-16 days before your next period.
To boost your chances of conceiving, aim to have regular sex (every 2 to 3 days) throughout your cycle so you know that there should hopefully be good-quality sperm waiting when the egg is released. An active sex life is all most people need to conceive.
I have attached a link with more information for you
By Lily (not verified) on 1 Sep 2018 - 13:22
Hi.. The last time I had intercourse was on May 3rd and I had normal period 3 months after that until last month my period lasted shorter than usual.. and for this month my period has been late for 3 days. I took a pregnancy test on August 13 and it came out negative. Is it possible that I’m pregnant?
By Midwife @Tommys on 7 Sep 2018 - 15:02
It does not sound like you are pregnant as you have had a negative test and periods since you last had intercourse. If you have concerns about your cycle then do see your GP.
By Kaylyn (not verified) on 10 Sep 2018 - 04:48
Me and my BF have had sex my last period stopped on 8/16/17 and I confirmed the pregnancy on 9/9/17 when would my due date be