Last night I went to a sex party. I made out (kissing) with several guys and one guy sucked my neck so hard and i found that there are some really big hickeies. I don't think any blood in it -- but i am not sure. The guy also gave me a blowjob (unprotected, no ejaculation). I asked him his HIV status he said he is negative. Also I found that I have a small mouth sore after the sex party -- it doesn't hurt, like a small cut or ulcer. Should I worry about HIV risk? should i contact my doctor to receive some PEP? I know this maybe low risk, but the hickey is really big and the small cut in mouth makes me worrisome.