I had full on intercourse on the 20th of January. The next day, I had unprotected intercourse with another guy, but he pulled out before he ejaculated. However, I know that is not always fool proof.

Background... I am 43 & single, trying to get pregnant from a friend (no strings attached & he has agreed to help me). I am also sleeping with the guy I have been with for over a year, but have been completely honest with him (he knows the situation) he does not want anymore children, so we have been taking precautions. Strange situation, but that is the way it is.

I have not had a period since 01/08/2008, and may be pregnant. What I want/need to know is did I conceive on the 20th or the 21st??