29 weeks pregnant
Week 29 of pregnancy means 203 days since the last period began. Use the form to place your own dates, or read the example below.
How it works
The due date is 280 days after the first day of your last period. Weeks of pregnancy are the days since that first day divided by 7. On this page the pregnancy is 203 days from the first day of the last period.
Worked example
Take a last period that began on 4 May. Add 280 days to get a due date of 8 February. Add 203 days to reach 23 November, the start of week 29. 203 divided by 7 is 29. That leaves 77 days to go. Dates in this example use a year with 365 days.
Common questions
Which trimester is week 29?
Third trimester. The first trimester covers weeks 1 to 13, the second covers weeks 14 to 27 and the third runs from week 28 to the birth. Week 29 is week 2 of the third trimester.
Why do weeks start from the last period and not conception?
Most people know the date of their last period but not the day of conception. Counting from the last period gives everyone the same starting point. A pregnancy is about two weeks longer on paper than from conception. Counted from conception, this would be week 27, which is 189 days.
How accurate is a due date?
Only a small share of babies arrive on the due date. Most arrive within a couple of weeks either side. Treat the date as the middle of a window. Here the due date is 8 February, and 77 days remain from week 29.
What if my cycle is not 28 days?
The 280 day rule assumes ovulation near day 14. If your cycle is much longer or shorter, your doctor may adjust the due date, often with an ultrasound. With a 35-day cycle some clinicians add 7 days, which would move 8 February to 15 February.
Does a leap year change the due date?
It can. A year with an extra day in February moves dates after that day by one. The calculator above uses the real calendar for your dates. The span from 4 May does not cross February. A leap year changes nothing for 8 February.