How Many Weeks Pregnant Am I?
Enter your due date or the first day of your last period below to instantly find out your current pregnancy week and day.
This page is for general pregnancy planning and date guidance only. It is not medical advice, diagnosis, or treatment. Pregnancy dates are estimates and can change after a scan or advice from your midwife, GP, or maternity team. Always speak to a qualified healthcare professional if you have symptoms, concerns, or questions about your pregnancy.
Calculate Your Due Date
How is my pregnancy week calculated?
In the UK, the NHS calculates your pregnancy from the first day of your last menstrual period (LMP). This means that for the first two weeks of your pregnancy timeline, you aren't actually pregnant yet! Pregnancy typically lasts around 280 days (40 weeks) from your LMP.
Please remember that pregnancy dates are estimates. Only around 4% of babies are born on their exact due date. Your 12-week dating scan will give you a more accurate timeline.
Frequently Asked Questions
- What if I don't know my last period date?
- If you know your conception date, you can use that instead. Otherwise, your ultrasound scan will provide the most accurate estimate of how many weeks pregnant you are.
- How many months is 12 weeks pregnant?
- 12 weeks is roughly at the end of your third month of pregnancy, marking the end of the first trimester.