My partner and I have been trying to conceive since march 2009 and havent been successful.
I had my period june 7th for approx. 4-5 days
We broke up the week of the 17th.
that day I was with someone else. unprotected who "pulled out"
got back with my partner the next day
(he knew)
and we have had sex since then still trying to conceive

had my period again on the 25th for approx 4-5 days

it is now the 21 of july with no period

took several test says negative the first two weeks of july

if i am pregnant what are the chances it's not my partners baby.