I got off he depo the beginning of the year...I just got periods a few months ago and when on the shot I had no periods. So it screws up the schedule no matter what.
Depo messes up your menstrual cycle a lot so when you stop getting shots, it takes forever to go back to normal. So it's not at all surprising that you're not having a period yet. Don't be surprised if it takes a really long time to get back to normal.