Pregnancy week by week: your complete guide

Your interactive pregnancy tracker. Find your week, see how big your baby is, what's happening to your body and what to sort next, then download your free planner and personal appointment calendar.

How far along are you?

Your date is saved on this device only, so it's here next time. Don't know your due date? Try our due date calculator.

Week by week

Explore every week of pregnancy

First trimesterSecondThird

Your appointments and key dates

Every NHS appointment, scan, vaccine and admin deadline, in order. Add your due date in the tracker above to see your actual dates, then save them to your phone calendar.

Appointment timings vary between areas, and you may have more if you need extra care. Your midwife will confirm your schedule.

Symptom checker

From heartburn to itchy skin: when it usually happens, what actually helps, and when to call your midwife.

No match. Try another word, or if you're worried, call your midwife.

Call your maternity unit straight away, day or night, if you have:

Any bleeding from your vagina
Fluid leaking from your vagina
Your baby's movements slowing down, stopping or changing
Severe or constant tummy pain
A severe headache, problems with your vision, or sudden swelling of your face, hands or feet
Severe itching, especially on your hands and feet
A high temperature, or you feel shivery and unwell
Regular tightenings or contractions before 37 weeks

Don't wait until your next appointment, and don't worry about bothering anyone. If you think it's an emergency, call 999.

Free downloads

Print them, stick them on the fridge, or keep them on your phone. No sign-up needed.

Calendar file

Your personal pregnancy calendar

Every appointment, scan, vaccine and deadline, plus a weekly bump update, added straight to your phone's calendar.

PDF · 13 pages

The Motherhood pregnancy planner

Trimester checklists, an appointment tracker, questions for your midwife, birth preferences and a bump diary.

Download the planner

PDF · 1 page

Week by week at a glance

Every week on one page: your baby's size, the key moments and what to sort. Made for the fridge door.

Download the sheet

Checklist

Hospital bag checklist

What to pack for you, your baby and your birth partner, and when to have it ready.

See the checklist

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Pregnancy, trimester by trimester

First trimester: weeks 1 to 12

The busiest weeks for your baby and often the hardest for you. Every major organ starts to form, and by 12 weeks your baby is fully formed and about 5.4cm long. You might be dealing with sickness, exhaustion and sore breasts, often while nobody else knows yet.

Key moments: take folic acid, refer yourself to a midwife, have your booking appointment by 10 weeks and your dating scan between 10 and 14 weeks.

Second trimester: weeks 13 to 27

For many people, the sickness eases and energy comes back. Your bump starts to show, you'll probably feel the first flutters between 16 and 24 weeks, and by 24 weeks your baby could survive with specialist care if born early.

Key moments: the whooping cough vaccine from 16 weeks, the anomaly scan between 18 and 21 weeks, your MATB1 form from 20 weeks, and telling your employer by the end of week 25.

Third trimester: weeks 28 to 40 and beyond

Your baby puts on fat, gets into position and gets ready to be born. You'll see your midwife more often, and it's time to pack the bag, fit the car seat and learn the signs of labour.

Key moments: the RSV vaccine from 28 weeks, going to sleep on your side, knowing your baby's movements and packing your hospital bag by 36 weeks.

Your questions, answered

How is pregnancy counted in weeks?

Pregnancy is counted from the first day of your last period, not from conception. That's why it lasts about 40 weeks, even though you conceive around 2 weeks after your period starts.

How many weeks is each trimester?

The first trimester runs to the end of week 12, the second from week 13 to the end of week 27, and the third from week 28 until your baby is born.

How do I work out how many weeks pregnant I am?

Enter your due date or the first day of your last period in the tracker at the top of this page. Your dating scan gives the most accurate due date, so update it once you've had your scan.

When will I feel my baby move?

Most people feel the first movements between 16 and 24 weeks, often later in a first pregnancy. From 24 weeks, get to know your baby's pattern and call your maternity unit straight away if it slows down or changes.

What appointments will I have in pregnancy?

In England, most people have up to 10 antenatal appointments in a first pregnancy and around 7 in later ones, plus a dating scan at 10 to 14 weeks and an anomaly scan at 18 to 21 weeks. Our timeline above lists them all.

When is a baby full term?

A baby is considered full term from 37 weeks. Only about 1 in 20 babies arrive on their due date, and anywhere between 37 and 42 weeks is normal.

When should I tell my employer I'm pregnant?

You can tell them whenever you're ready, but legally you must tell them by the end of the 15th week before your due date, which is around 25 weeks. You'll need your MATB1 form, available from 20 weeks, to claim maternity pay.

Keep reading

This guide is general information based on NHS guidance, not medical advice. Every pregnancy is different, and baby sizes and weights are averages. If you're worried about anything, contact your midwife, GP or maternity unit. See the NHS week-by-week guide.

If you’re trying to conceive (TTC), you probably know that there are certain foods and nutrients that become especially important once you’re pregnant. But nutrition plays a vital role even when trying to conceive, much like laying a strong foundation before constructing a house.

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