For the last month, after i have sex, i use the bathroom and i have a blood discharge. It is not my period. It happens just once after sex. I then get really bad cramping in my abdomen area. This past week, i have had a very heavy clear/yellowish discharge. I do not belive I am ovilating. I also get my period every month on the 19 or 20 and for 5 days. This month it came 4 days early and lasted 6 days. I have always been normal! Please help!