I performed oral sex on a guy that I later found out has HIV. I certainly swallowed a bit of his cum during the oral sex and the next day discovered he is taking Atripla (medicine for hiv treatment which is said to reduce the viral load to undectable in most cases).
I freaked out and bought lamivudine/zidovudine 150/300mg as a preventive measure (I'm travelling so that was my option). What are my risks? Am I overreacting?