Annoying bleeding from DEPO

Well I've always been regular and I was always on a 30 day cycle even after my daughter was born but I took the depo shot this April fools day and I was bleeding the whole time I was on it then no bleeding for one month then I thought I got my period but when I got off my period I just would bleed a little here and there until I thought was another period only lasted four days and was light and that was in August well I started bleeding on the 5th and I'm still bleeding but it only lasts half the day and I don't have cramps or backache lots of energy but I don't even know if I'm not ovulating or how long it will take for it to go back to normal