Pregnancy Calculator

A normal pregnancy lasts 40 weeks (280 days) and is calculated from the first day of the last menstrual period. Births between weeks 37-42 are considered term. Before 37 weeks is considered preterm birth.

First trimester: dual screening and nuchal scan. Weeks 18-22: detailed ultrasound. Weeks 24-28: glucose tolerance test. Regular blood pressure, weight, and urine checks at every appointment.

Yes. In cycles longer than 28 days, ovulation occurs later, so the estimated due date shifts forward. In shorter cycles, an earlier due date is calculated.