We'll probably know soon enough. Maybe she went to a club, got trashed and fucked the wrong guy bareback. No need to overanalyze.
Fair point. As we all know, girls in clubs will take the verbal "i'm clean" or online the "ddf" as gospel when the situation is heated and intense and the guy is good looking enough. Bareback sex is more common than condoms with night club hookups, at least that was the experience in my city.