HELP! am i pregnant??!?

ok so i had un protected sex on May 17th and it is now June 12th how many weeks has it been since May 17th this??? im really scared cuz i have some pregnancy symptoms, than they go away and i feeel fine. cuz most of that stuff happends to me before i had unprotected sex. and my period soemtimes like never comes : S idunno if i have one or not but im SO scared i dont know what to do.. but my period came last night. and its still here today first its been coming out red kind of light than dark with clumps in it :S but not a lot. and now its brown? whats happening and am i pregnant??? im going to the doctor tomorrow and if i am pregnant i am getting an obortion.. plz dont judge me im doing it for the best cuz if this baby it will suffer cuz im very young and i dotn want to have to see it go through that. cause im not ready for one. PLZZZ dont judge im feeling so lousy as it already is and im so stressed out but the most important question is.. how many weeks has it been since May 17th till today>? ( June 12th obvi )