I an 22 and have been on the Depo shot for almost 2 years now. I have not had a period the entire time, but lately I have had brown stringy discharge. I hear this is normal for the shot, but is it normal for it to come so late and randomly? Also, how long will it stay/is there a way you make it stop? It s been almost 2 weeks now.. Thanks!!!! Oh, and could antibiotics have anything to do with it? I was on Bactrim right around the time it started.. Thanks again!!!