Not even a month ago I got the dep shot, I was on nuvaring for about 4 months before that, I took the nuvaring out on time and got the depo shot the following day, about two weeks after the depo shot(about 4 days now) i have had this yucky brown blood stuff coming out in random spurts, I have had unprotected sex only once and that was well over a week after I got the shot, I'm not having any signs of pregnancy like tender breasts or cravings or drinking lots of fluids, but I notice that the bleeding gets worse whenever I am stressed out or very active, like moving around a lot like at work.  I'm not sure what to think, can anyone tell me what this nasty stuff is and how I can stop it(if at all possible)?