I think I accidentally exposed myself to contracting an STD, particularly HIV. I hung out with a girl who I've known for a few months now a few days back. She engaged in oral sex on me. Everything went as planned, but while it was occurring I remembered something she had told me earlier that day at dinner: she had been to the dentist, had two fillings, had bit her tongue, and it had bled for most of the afternoon. I didn't see any blood on or around myself, but I am really concerned now that I let that happen. Between the fillings and the biting of her tongue, I'm willing to bet she still had some blood in her mouth, and I know this is a very easy way to transmit something like HIV. I also made out with her, but I don't think I have any open cuts in my mouth, so I'm not too worried about that type of transmission. Afterwards, I asked her if she has been tested recently, she hesitated a bit, and then said yes. Am I worrying too much or should this suggest a test at the three month mark?