How the Due Date Calculator Works
Most pregnancies last around 40 weeks (or 280 days) from the first day of your last menstrual period (LMP). While this is the medical standard, the actual date of conception usually happens about two weeks after your period starts, during ovulation.
Understanding Trimesters
A typical pregnancy is divided into three trimesters. The First Trimester (weeks 1-12) is a period of rapid development. The Second Trimester (weeks 13-26) is often when you start to feel the baby move. The Third Trimester (weeks 27-40) is the final stretch as your baby prepares for birth.
Why Cycle Length Matters
Standard calculators assume a 28-day cycle. However, if your cycle is 35 days, you likely ovulated a week later than average. By including your cycle length, our tool provides a more accurate estimation of your due date than simple LMP-only calculators.
When to See Your Doctor
Once you've calculated your estimated due date, your next step should be to schedule a prenatal appointment. Early prenatal care is essential for a healthy pregnancy. Your doctor will perform a more detailed assessment and may use an ultrasound to confirm your baby's growth and due date.