So I'm pregnant. 7weeks from last period August 9,2017. I had sex with this guy August 16 and it was only a one time thing. Before those days I was with my bf but we had a fall out. Now after August 16 we got back together and now I'm pregnant from my last period. I'm worried of who the dad is. My period only lasted 3-4 days that time so I told my bf that it could be the other guys kid as well and of course he's disappointed. I am aware what I did wasn't right but he was a crappy guy to me and etc. I know I might be called names but I'm prepared. I'm just trying to see what my odds are of this other guy being the dad.