I received my very first depo provera shot in January during my menstrual cycle. My period immediately stopped that day. Two weeks later my period comes again and has not stopped since then. Although it isn’t as heavy as it was in the beginning. Now its continuous spotting.

I received my second depo provera shot around a month ago. I was given a higher dose and was told that it would help with break through bleeding however it still has not stopped

Is there any reason this might still be happening or anything I can do that will help it stop.