I had sex with someone other than my husband and am now pregnant. How do I tell the exact date that the baby was conceived?

Exact dates are tricky.

But the best way is to find out an estimate of how far along you are with your doctor, and usually he can give you an estimate of when it happened.

If you know the dates of your periods and you keep track of them, this may help.

Pregnancy Calculator: Find out key dates for your pregnancy (http://www.onlinepregnancytest.biz/pregnancy-calculator.html)

They are defenitly tricky. I work for an obgyn office. And we usually figure out when due dates are determined due to last period. Usually a woman will start to ovulate 14 days after the first day of last menstrual period. Usually in that time frame is when a woman can become pregnant. But again every woman is different on that window for opportunity. If you had sex with two different partners in a close time frame during ovulation that could make it even harder to determine. I agree with jenniepepsi, talk to your doc, even though its hard to figure out.. the doctor may be able to pin point it a little easier.

Im assuming your asking because your trying to determine the father of your baby. Unfortunately even if the doc can pin point it a little easier, it may not be fool proof. You may not know 100% unless you have a paternity test done. Good luck.

How close did you have sex, there is no exact, only @ dates So unless it was 3 or 4 weeks between sex with husband and boyfriend, you will have to wait and get a DNA test