Calculate your estimated due date from your last menstrual period, conception date, or ultrasound results. Includes trimester tracking.
| Trimester | Weeks | Key Milestones |
|---|---|---|
| 1st Trimester | Weeks 1–13 | Heart begins beating (wk 6), embryo becomes fetus (wk 10) |
| 2nd Trimester | Weeks 14–27 | Movement felt (wk 16–25), anatomy scan (wk 20) |
| 3rd Trimester | Weeks 28–40 | Rapid growth, lung maturation, baby positions for birth |
Due dates are estimates. Only about 5% of babies are born on their exact due date. Full term is 39–40 weeks; 37–38 weeks is early term.