Find out when to expect your new arrival and track key milestones in your journey.
Standard is 28 days.
Select your last period date to calculate.
Doctors typically calculate pregnancy as lasting 280 days (40 weeks) from the first day of your last menstrual period (LMP). This is known as Naegele's Rule.
However, only about 5% of babies are born exactly on their estimated due date. Most arrive within a week before or after.
Weeks 1 - 12
Weeks 13 - 27
Weeks 28 - Birth