I found out I was pregnant on 6/20/13. I had my first ultrasound on 7/18/13 showing I was eight weeks and five days pregnant. I have read that ultrasounds in the first trimester are extremely accurate (only 2-3 days off if even that). I have no clue when my LMP was. I have had 3 more ultrasounds since my first at various weeks and my due date has not changed any. Okay, so I have had sex with Guy A quite frequently for three years now and I had a one night stand wit Guy B on 6/9/13. Who is likely the father of my child? Me and Guy A really hopes it is him. I am a nervous wreck over this. Any information is greatly appreciated. We do plan to get a paternity test but I have to know whom is most likely to be the father like now.