Maybe pregnant?

So I was suppose to get my period awhile back... This guy and I had sex. Yes I knew him but we weren't in a relationship yet.. Any ways he did change his condom 3 times... Making me kind of worried while we were having sex because I was fertile... Then once we had sex he stopped all communication... But I feel like I may be pregnant due to not getting my period and just being weirdly sick... I don't want to think the worst because now I have no way to contact the guy and I am stuck... I am scared to take a pregnancy test but I know I have to in order to find out... What should I do about the dude if I do turn out to be pregnant???