the chance that your partner, as a heterosexual male in North America had HIV is very, very low (less than 1 in
1000) and even if he did , the risk of
getting HIV from a single act of
unprotected vaginal intercourse were also less than 1 in 1000. Thus, statistically, your risk from the single exposure you describe was less than 1 in a million even before you were tested.
Then you had a HIV ELISA blood test at 3 months.