My exboyfriend lived near a hospital and once, we met up there (he was sitting on the waiting bench) before we went to his flat. He started fingering me and it was only later that I realized he hadn't washed his hands. Its over five months later now, I've been ill twice in the meantime, but nothing serious (it only lasted a couple of days each time). I feel fine, its just that I'm terrified that he infected me with something and it hasn't shown up yet. Is that possible/worth worrying about? Is there anything I should do?