Ever since April of this year I have had my period twice a month. I just had one on May 5, 2012, and I believe it came again around the 28th ( I remember I said it was 18 days later).

My fiancée and I never use condoms and he ejaculates inside of me every time. However, I did have sex one time with another man on June 8, 2012. He used a condom, and pulled out before he ejaculated.

I took a pregnancy test today and it came back positive. Is there a chance this is not my fiancées baby. I REALLY NEED SOME HELP!

There is no way to tell for sure until after the child is born and a paternity test can be done.