abnormal uterine bleeding
"First time trying the shot. I got the shot in September and everything was fine. I have never had regular periods (as far as coming when they should). So I thought I would never have a period again. November 13th comes around and I'm spotting. On the 15th my period comes. I have been spotting different colors also. Not to mention the stomach and back pains. This whole process has been going on for 5 weeks. I know the pill gives you regular monthly periods which is something I'd rather deal with. Can't wait to switch back to the pill. No 2nd shot for me!!"