I've been bleeding for like 2 and a half weeks now. I had a regular period about 3 weeks ago. This bleeding is light and heavy..on and off. There is nothing abnormal about the blood though. Looks just like I'm on my period. No other discharge, but today I woke up and I have the most terrible pain in my lower back. I'm on Depo, I have no clue what is going on. Anyone have any ideas?