I am on depo and just started it Dec 20th my next one isnt till March 14th. before then I have been in alot of pain in my abdamin before I started depo massive pain and made an appointment with my doctor I found out I had two small cysts but still went on depo. I am still in alot of pain but I have started to discharge a light brown colour which has now turned to a black colour it has been going on for three weeks straight I dont know what to do.