Hi, I just need a little insight.. my periods are always normal. Last month(Oct) I started to see some dark brown blood a week before I was supposed to start. It gradually got more red and then a little heavier. There was a few days that I didn't have to wear anything. Well, its day 10 and Im still bleeding. My periods usually last 5 days. I did have sex around ovulation.. Im a bit concerned. I took a pregnancy test a couple days after the spotting and it was negative. Does anyone know what can cause this?? Please help