Here are the risks for HIV. Having unprotected vaginal or anal sex or sharing IV needles to inject drugs. Oral sex and rubbing outside a vagina to a penis are not risks. Air and saliva inactivate the virus. The only potential risk is if you did indeed penetrate her unprotected for 30 seconds as you say. However, the risk is minimal. It is less than 1 percent. That's even is she is hiv positive. It's zero if she is not. You do not need pep. PEP is a hard medication to take and not warranted in this situation. They reserve it for situations where the other person is KNOWN to be HIV positive. Personally, I wouldn't start testing right now. You are very unlikely to have contracted HIV from this. I'd wait until 28 days and take a DUO test.