My man and I have A LOT of sex..most of it unprotected because I've been on the pill for over a year and he always pulls out..but about two weeks ago (maybe a little longer) he pulled out and came on my stomach and then went back in without realizing what he had just done. We weren't worried but I started to feel horribly nauseaous every day at random and I was supposed to start my period this week and it was three days late and I got it now but it's really light. Should we be concerned?