HIV: I've been HIV positive (male) for six years now. I will tell you what I know, although I am not a doctor. First of all, you should find out if the girl is positive or negative. If she is (truly) negative then you have nothing to fear. If she is positive, you may still have nothing to fear if she has an undetectable viral load and/or she is or has been on medication. Was she on her period when you penetrated her? HIV is best transmitted blood to blood and semen to blood. Other fluids are somewhat less of a carrier, but it doesn't rule transmission out altogether. As far as how many times you should get tested, definitely do the six month test. Personally, I pretty much knew that I had HIV and my tests came up negative for at least six months. Then, one day...positive. I'm not trying to scare you, but HIV can take from six months to several years to show up. sometimes people can carry it for years and not show a positive test result and then suddenly it shows up, although this seems to be a rare situation. From what I've read of your experience, my guess is that you are in the clear and you're just worrying yourself to death for no real reason. Relax. Stress is the ultimate enemy, Even if you come up positive, you're viral load will be so low (probably under 100,000 copies) because you caught it so early that medications will most certainly allow you to manage it successfully with no real issues. But I don't think you're going to have a problem. I've seen guys do much riskier things than what you did for years and never come up positive. I think you're worrying too much.
you have a post going in the std experts forum. follow up there and get your money's worth.