Hi, I gave oral sex to a guy. However, after spitting out the ejaculate I realized that it had a tinge of blood on it and on the saliva. This is due to the braces I had. However, I checked the guy's penis and there were no skin breaks or blood on it. I tested negative after 7 weeks (anti hiv 1/2 test only). I would like to ask whether I should still do another test such as p24 and another 1/2?