You're right about the timing of your symptoms; they cannot be due to the sexual exposure you describe. You caught a cold a few days earlier, that's all. The chance of getting HIV after that exposure is low enough that you really don't need testing at all--but if you're nervous, get a standard HIV antibody test 6-12 weeks after the exposure. Definitely do not waste your time and treasure on a PCR test.
You answered the question about PEP yourself, more or less: yes, the risk of catching HIV orally really is that low. You would probably have to treat 1000 or maybe even 10,000 people to prevent one of them from getting HIV, even if exposed to a person with known HIV infection (and you don't know that you were exposed to an infected person).
Good luck-- HHH, MD
I think the risk IS that low that they don't provide PEP. PEP itself carries some risk of health problems, some very severe. So they only use it if you were definately exposed during a high risk activity.
I am a HCW and couldn't get PEP after a needlestick from an unknown person (syringe sticking out of a needlebox). So I doubt that it would be necessary after a few seconds of oral sex. Your guilt and fear are making you believe that this exposure was somehow the exception and that it was "high risk". It wasn't.
I don't think the doctor here will recommend a PCR, either.
I am interested to see where the guidelines and opinions on prescribing PEP go in the near future, as influenced by lawyers. I just read the other day, I think it was in Britain, where there is a big lawsuit from some guy that got HIV and was either denied PEP or was not informed that it was available. I will see if I can find it again. The whole thing just seems like a lawsuit waiting to happen to me.
Particularly your case where there is about a 1/300 risk if that needle had been infected with HIV. If you are willing to sign for the risk of taking PEP, I think it should have been offered to you.