Okay so I'm due march 15 2013 with a baby boy according to all my ultrasounds my baby measures exact to the day of what he's supposed to and so do I! So I was in between partners around this time. Last time I had sex with my ex was one time on June 10. And then got with my new bf who I had sex with pretty muh everyday after that. My doc sat down with me and explained that ultrasounds can't be that far off and I had to get pregnant at the earliest June 18 through about June 23 or so. And my exs sperm couldn't possibly live as Long as 9 days. Okay so why am I stressing my self out about it so much! Like what if its wrong and it is my exs?! I'm stuck on this and I don't know if its all in my head. I mean if I got pregnant by my ex the baby would be measuring a lot diff right? My doc seems to have no doubt that its my bfs baby so why can't I move on from the chances of it not be. Any input would be great!