I had my period last month (Sept 16, 2011, first day of period) Had unprotected sex on the 30th of Sept and from the information online I was ovulating. BUT had a period on October 12 that lasted on and off. Started off fine but only 2 days then like I would have a period for a few hours and then I wouldn't for a few hours. My periods have been pretty normal. Never have done this before. If I could please get some answers I would greatly appreciate it!