If your partner was a man who also has sex with men, has been imprisoned, was an injection drug user, or an immigrant from a country with a generalized heterosexual
HIV epidemic (e.g.,
sub-
Saharan Africa), that would increase the risk. But even if had HIV, the chance you were infected is low. The estimate for the average risk of HIV transmission, from an infected male to his female partner by vaginal sex, is once for every 1,000 episodes of intercourse.