I am sexually active and use condoms. I just ended my period last Wednesday, and it was little lighter than usual. Then after work yesterday I went to the restroom and discovered that a whole gush of blood was all over my underwear and pants (good thing my pants were black) with come clott like stuff. the bleeding stopped after a couple hours but I continued to have vaginal discharge. Prior to this I had been feeling nauseous and have had mild cramps. now the bleeding is gone and the discharge is light. What could this be?