My problem is that after having sex with my boyfriend in the afternoon I realized that I was bleeding. Was just few drops till evening ,but didn't quite stop. During night it kind of increased. My periods got over just 5 days back. Am I having periods again? Can this be because of rough sex or some vaginal infection? Can this lead to some serious problem? I am really tense.

Well if you are having aggressive sex continuously that may not be the greatest idea. Spotting can be the answer, which is natural, but if it doesn't hurt yet than I wouldn't be to worried.