How far along am I?
See how many weeks pregnant you are today, which trimester you're in, and how many days are left.
We filled in the due date you saved on this phone.
How do you count weeks of pregnancy?
Pregnancy weeks are counted from the first day of your last period, not from the day you conceived. So at the moment of conception you are already about 2 weeks pregnant. A full pregnancy is about 40 weeks. The first trimester runs to the end of week 13, the second from week 14 to the end of week 27, and the third from week 28 until birth.
How we calculate this
We work out the start date (due date − 280 days) and count the days from then to today. We split the days into weeks and days. Trimesters: 1st = weeks 0–13, 2nd = weeks 14–27, 3rd = week 28 onward.
Questions moms ask
What does '12 weeks, 3 days' mean?
It means 12 full weeks and 3 extra days have passed since the start of the pregnancy. You are in your 13th week.
What month of pregnancy am I in?
A rough guide: weeks 1–4 is month 1, weeks 5–8 month 2, weeks 9–13 month 3, weeks 14–17 month 4, weeks 18–22 month 5, weeks 23–27 month 6, weeks 28–31 month 7, weeks 32–35 month 8, and weeks 36–40 month 9.
Why is my doctor's week different?
If you had a dating ultrasound, your doctor may have changed your due date. Enter your doctor's due date here to match.
How many weeks is full term?
Full term is 39 weeks to 40 weeks and 6 days. Babies born at 37–38 weeks are called early term.
Related tools
This tool gives an estimate, not medical advice. Every pregnancy and every baby is different. If you're worried about anything, talk to your doctor or midwife.