i'm wondering if this sounds like my ocd or if it is an actual worry i really need some help here.

ok so on april 16th 2004 i went to this strange get together with my brother and a few friends i wans't feeling well so i think i went into the apartment with another friend for like maybe 5 mins and then the rest of the time stood outside we were there for like 30 or 45 mins i think.... well i got to thinking what if while i was there somebody stabbed me with an hiv infected needle or something and i didn't know it. but b/c i'm paranoid about stuff like that i thought i know i would remember if that happened and freak out. so then on september 10th or 8th one of the two 2004 like 5 months after this really wierd get together, i had an HIV test routinly done b/c i'm having a baby in march of course it came back negitive b/c i'm not in an real risk factor. but my mind cant stop the what if course. like i think what if 5 months wasn't enough time after this wierd get party thing or what if i have some rare form of HIV and they just didn't catch it. i've read hours of information on HIV on the internet and almost every doctor says a negative test at 5 months is a good thig and further testing isn't needed well if i know thats true than why am i still paranoid. HELP ME i can't stand this anymore! i need help i scared of everything in lfie casual contact freaks me out b/c to me everybody around me has HIV and if they come to close or touch me i think i'm gonna get it. i know thats not possible but i need some relief.
-nicole!