Pregnancy Due Date & Checkup Planner

How the due date is calculated

The estimated due date uses Naegele's rule: 280 days (40 weeks) from the first day of your last period, adjusted for your cycle length (ovulating later shifts the date later). Only about 1 in 20 babies arrives on the exact date — most come within two weeks either side — and a first-trimester dating ultrasound is more accurate than any calendar method and will refine this estimate.

The standard checkup schedule

The visit plan the tool shows follows the widely used antenatal pattern: a booking visit at 8–12 weeks (blood tests, history, folic acid check), dating & screening scan at 11–14 weeks, the detailed anomaly scan at 18–22 weeks, glucose screening at 24–28 weeks (gestational diabetes), plus blood pressure and growth checks that become more frequent from 28 weeks — typically every 4 weeks, then every 2 from 36, then weekly at term. Your own doctor may adjust this; higher-risk pregnancies get more visits, and that plan always wins over any calculator.

Warning signs at any stage

Bleeding, severe abdominal pain, severe headache with vision changes, sudden swelling of face/hands, fever, fluid leakage, or a clear drop in the baby's movements after 28 weeks — these are same-day medical calls, not wait-for-the-next-appointment items.