help with conception

just a little background on the situation...I will be 33 weeks pregnant tommrow and as my due date grows closer im stressing more and more about the possibilty of the father.

my lmp was 05/08/10 which would mean that i likely concieved sometime between 05/19-06/01 at the latest

my b.f at the time (guy#1) and i had unprotected sex multiple times throught that time period and broke up 06/02.

around a week or two after the break up i got back with an ex (guy#2) and hooked up a few times.

on 06/22 i took a pregnancy test and it was positive making me 6w3d pregnant... had an ultrasound on 06/25 that confirmed the pregnancy and dates matched according to that.

with the research and stuff ive done it seems very unlikely that guy#2 could be the father which is what im hoping since he pretty much hasnt talked to me since i found out about the pregnancy and guy#1 has been there since he found out, going to all dr apts and the whole 9 yards. i know he would be heart broken if it turned out the baby wasnt his, although both guys know the possibility... i know the only way to be 100% positive is to get a paternity test which i plan on doing after the baby is born. i gues im just looking for someone elses input to make sure the info ive found and my assuptions are correct. any help is appriceated and please no rude answers thanks