Question 1

How is the due date calculated?

Accepted Answer

The most common method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14.

Question 2

How accurate is the estimated due date?

Accepted Answer

Only about 5% of babies are born exactly on their due date. Most births occur within 2 weeks before or after the estimated date. An ultrasound in the first trimester gives a more accurate estimate.

Question 3

What are the pregnancy trimesters?

Accepted Answer

First trimester: weeks 1–12. Second trimester: weeks 13–26. Third trimester: weeks 27–40. Full term is 39–40 weeks; early term is 37–38 weeks.

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