i know this might just be in my imagination, but i have to ask someone, because I'm really scared right now.

My boyfriend and I have unprotected sex last Saturday (5/28). It was exactly 2 weeks after the first day of my last period. I know for sure that his sperm count was very, very low; but still it is very stupid thing to do. Now, for the last two days (5/30-5/31) my stomach have a very funny feeling. I think it's kinda get harder and bigger. I've got gas too. Is it have anything to do with pregnancy, or it's just my stomach ? i have to admit that i have very little knowledge about pregnancy. Can anyone give me some kind of answer ?