I had intercourse on 4th day of my cycle, i.e. during menstruation (day 1 as the day periods started). I had even spotted the next day. Used protection too. I was still worried so i took 2 Yasmin combination pill on day 5 and 2 Yasmin pills on day 6. I did not take the pill after that. Ever since I have had heart burn and stomach ache, belching and pain between the shoulders. Today, day 13 of my cycle, i am bleeding, infact heavier than day 1 of my periods. The discharge is fresh bright red with mucous. I have never had mid cycle bleeding before. What is causing this?? Its not pregnancy or implantation bleeding, is it?? considering i am only day 13 of my cycle today........................