A due date calculator estimates when your baby will be born based on your last menstrual period (LMP) or conception date. Most pregnancies last about 40 weeks (280 days) from the first day of the last menstrual period.
Your due date is calculated using Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). If you know your conception date, 266 days are added instead. Only about 5% of babies are born on their exact due date - most arrive within two weeks before or after.
Gestational age is counted from the first day of your last menstrual period (LMP), which is about two weeks before conception actually occurs. Fetal age (also called embryonic age) counts from the date of conception. This means gestational age is always about 2 weeks more than fetal age. Doctors and pregnancy apps typically use gestational age.
Yes, your due date may be adjusted based on ultrasound measurements, especially during the first trimester when dating is most accurate. An early ultrasound (between 8-12 weeks) can confirm or adjust your due date. Later ultrasounds are less reliable for dating because babies grow at different rates.
Pregnancy is divided into three trimesters. The first trimester (weeks 1-12) is when major organs form and morning sickness is common. The second trimester (weeks 13-26) brings rapid growth, first kicks, and usually more energy. The third trimester (weeks 27-40) is when the baby gains weight and prepares for delivery.
You should schedule your first prenatal visit between 6-8 weeks of pregnancy. Contact your healthcare provider as soon as you get a positive pregnancy test to set up this appointment. If you experience heavy bleeding, severe pain, or other concerning symptoms at any point, seek medical attention immediately.
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