hi, I m a 22 y/o male. a few days ago i had an anonymous encounter with a mtf pre-op transsexual. she performed unprotected oral sex on me and I fingered her. in the morning i noticed i had a small, scabbed-over abrasion on the finger i fingered her with. i just don t know anything about this girl, and i m afraid that i might have exposed myself to hiv or some other STD. she claims she is negative and clean, but i don t know what that s worth. i did not have unprotected anal sex with her. i m really scared and i m going crazy stressing out over this. i know the things i did with her are low risk for contracting hiv, but i can t stop thinking about it. have i made a huge mistake? should i go see my doctor right away? or can i relax a bit? i just don t know...