I've been on my period for 7 years now, and they have all been completly normal 6 day cycles. This month I started my period and ended completly normal but two weeks after I got off I'm back on again. This is the second time this month I've gotten my period and this has never happened. The only thing I can think of is I got strep throat really bad on monday and started taking moxicillian. The next thing I know, the very next day, tuesday, I started my period. AGAIN? I was just wondering why?! Or if there is something wrong with me?