I has on the depo shot for 8 years, and 3 years before that. I missed a shot the first time I was on Depo and my period didn't come back on. I went to my doctor and discovered I was pregnant. A got back on the depo after I had my son and 8 years later I decided to get off the shot for good.I have been off the shot for a year now. My period came back in August and has been fairly regular up intil November. I thought I could have been pregnant because I had sex on all my fertility day according to the iPhone MYdays app. I was feeling tired, dizzy, lower back and adomenal pain then my period came 5 days early. No cramp, tender breast, very heavy, a lot of clots, bright red blood and it seems like it has no end.(never had this happen, always had light periods) It looks like a murder seen when I go to the restroom. Its been 4 days since it started and my period usually last 5 days, I'm on the 4th day now and its not lighten up. I never had a heavy period and this is starting to freak me out. I started taking prenatal vitimins because I heard there were good for you. Could the vitimins be why my period is early and heavy this month? Could I be having a miscarriage? Test were negative