Even if you only had sex once during your fertile period, you wouldn't necessarily conceive right then.It's possible that the sperm hung out in your fallopian tube for a few days until your egg came along, at which point it fertilized the egg and your baby was conceived.Human gestation is the same for everyone: It takes about 38 weeks from the day of conception to the day you deliver.Very few expectant moms know exactly when they conceived, however.If you want to, you can view a sample due date report.The calculator on this page can help you work out when you might expect your baby to arrive. As part of your antenatal care, your midwife will also offer you a dating scan that will give you a more accurate date for the birth of your baby.Most are born within a week either side of the estimated due date.
As a result, most people, including health professionals, will date your pregnancy based on your LMP (last menstrual period) instead.
This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived.
Baby Center's Due Date Calculator uses the same approach that your provider is likely to use.
Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.
To find your due date, use the drop down menus below to enter the date of the first day of your last period, and click 'calculate date' - the calculator will do the rest.