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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.
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.
The result a due date calculator will give you is based on 40 weeks of pregnancy.
This is right in the middle of full term, which is why so few babies are actually born on this exact day.
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.
This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived.
Another study in 2013 found that even where the date of ovulation was known, the length of pregnancy varied by 37 days — even if they excluded women who had complications or preterm births.
Human gestation is the same for everyone: It takes about 38 weeks from the day of conception to the day you deliver.
Baby Center's Due Date Calculator uses the same approach that your provider is likely to use.
It gives you a due date that's 40 weeks from the first day of your last period.
At the end of the ‘fertile window’, the probability of pregnancy declines rapidly and by 12-24 hours after she ovulates, a woman is no longer able to get pregnant during that cycle. NEJM (1995) 317Remember the ‘fertile window’ is the six days leading up to and including ovulation.
For those women who are not aware of their ‘fertile window’ or when they ovulate, sexual intercourse is recommended every 2 to 3 days to help optimise their chance of conceiving. The three days leading up to and including ovulation are the most fertile.
Very few expectant moms know exactly when they conceived, however.