So, on September 24 I started my period. Well I am guessing it was period. It was brown, but a lot more than just spotting. It was like a light period but brown, and that lasted about a week. Then on October 1st, it was a mix of the brown stuff and blood. Then it just became regular blood and I am still on it (10/7) and it doesn't look like it's going to end anytime soon.My diet isn't bad, I am healthy. I am a good weight. I am on the Depo birth control shot, but my doctor said that would make periods almost disappear. Not last longer. What could cause it?