On the other hand, the statistical chance your partner had HIV is exceedingly low, probably well under 1 in 1,000 -- assuming, of course, she doesn't have special risk factors
(injection drug use, commercial sex work, etc). And even if she did, your risk for a single episdoe of unprotected vaginal sex was on the order of 1 in 2,000. Taken together, these two facts translate into a risk you caught HIV somewhere in the range of 1 in 1-2 million. Pretty good odds!