Dating a pregnancy without a period

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.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.You’ll note that it says approximately day 14 and day 28.In textbooks, we often see that women have 28 day cycles and everything has a nice schedule.Another way to find out your due date is by the size of your uterus.When you are about 12 weeks pregnant, your doctor or midwife can feel the top of the uterus (fundus) above your pelvis.

Determining the Estimated Due Date The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. Conceptional age, menstrual age, and ultrasound age: a second-trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period.

So without knowing the day of conception, how does anyone determine a due date? The method typically used by healthcare providers is simply to count from the first day of your last period.

For women with a menstrual cycle of average length, that day is usually about two weeks before conception, which explains why pregnancies are said to last 40 weeks.

I have absolutely no idea when my last period was, and they are also very irregular and erratic. But I know the date my husband and I 'conceived'.

But I know the date my husband and I 'conceived'. It was 29th May, so how do I calculate my due date without knowing my period?