Do I have OCD?

Let's see...I had an HIV scare not too long ago but was tested negative. I was assured by the doctor and also by the knowledgable members in the HIV forum that I can fully trust my negative result and move on. But I seem to have trouble doing so. I mean, alot of the time, I'm thinking clearly and can accept I don't have it. But there's times when the HIV worry pops back into my head and it just worries me all over again. If I even think about having sex with any girl I like, I feel like I'd be giving her a death sentence basically. So it's like I'm scared to even have sex, even though I know I should really accept my negative result and move on.