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Pregnancy Calculator

Find out how far along your pregnancy is. Enter the first day of your last period or your due date to see your current week and trimester, and follow your baby's growth week by week.

  • Free, no sign-up
  • Nothing you enter is stored
  • Updated 1 Oct 2026

Find your pregnancy week

See how far along you are and what is happening this week.

I know my
21 days35 days

Leave at 28 if you are not sure

Your pregnancy week will appear here

Enter the first day of your last period or your due date, then press Calculate.

How are pregnancy weeks counted?

Pregnancy is counted from the first day of your last period, not from the day you conceived. Conception usually happens about two weeks later, so you are already counted as two weeks pregnant at that point. A full pregnancy is about 40 weeks.

When you are 12 weeks and 2 days pregnant, you have finished 12 weeks and are in your 13th week. The calculator shows both.

For example, if your last period started on 1 Mar 2026, then on 26 May 2026 you are 12 weeks and 2 days pregnant. That means you are in week 13, and your baby is due on 6 Dec 2026.

Pregnancy trimesters

TrimesterWeeksKey changes
First1 to 13Organs start to form. Nausea, tiredness and sore breasts are common.
Second14 to 27Your bump shows and you feel movements. Many people have more energy.
Third28 to birthThe baby gains weight and gets ready for birth. Sleep can get harder.

Common check-ups and scans

WhenWhat
Weeks 6 to 10First antenatal visit, blood tests and early scan if needed
Weeks 11 to 14Dating scan and screening tests
Weeks 18 to 20Anomaly scan to check the baby's growth
Weeks 24 to 28Glucose test for gestational diabetes
From week 28More frequent check-ups until birth

Your doctor may suggest a different schedule based on your health and history.

Tips for a healthy pregnancy

  • Take folic acid and other supplements your doctor recommends.
  • Eat a balanced diet with enough protein, iron and calcium.
  • Stay active with gentle exercise such as walking, unless your doctor advises otherwise.
  • Avoid smoking, alcohol and medicines your doctor has not approved.
  • Go to all your check-ups and scans.

When to call your doctor

  • Bleeding or fluid leaking from the vagina.
  • Severe belly pain or cramps.
  • Severe headache, blurred vision or sudden swelling of the face or hands.
  • Your baby moving less than usual in the later months.
  • Fever, or vomiting so much that you cannot keep fluids down.

Frequently asked questions

1.How many weeks pregnant am I?

Count the full weeks since the first day of your last period. If you know your due date, count back 40 weeks to find the start. The calculator does this for you.

2.How many months is 40 weeks of pregnancy?

About nine months. Weeks are used because they are more precise; most months are a little over four weeks long.

3.Which week does the second trimester start?

Week 14. The first trimester runs to the end of week 13, and the third trimester starts at week 28.

4.Can I use my due date instead of my last period?

Yes. If your doctor gave you a due date after a scan, choose Due date in the calculator. It is often more accurate than counting from your last period.

5.Why do I feel different from the weekly guide?

Every pregnancy is different. The weekly notes describe what is common, and it is normal for symptoms and timing to vary. Ask your doctor if anything worries you.

6.Does the calculator store my dates?

No. The calculation runs in your browser, and the dates you enter are not sent to Policywings or saved.

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