I've been on the depo-provera provera (medroxyprogesterone) shot for nearly three months now. i've had my period for close to ten days. when will it end? are long periods normal?

See below: I would highly suggest that you see your doctor because having a period is not normal for this - and you might benefit from using Lysteda or possible a birth control pill with estrogen.

Yes: Bleeding on Depo Provera (medroxyprogesterone) can be very unpredictable. Eventually, if you are lucky, all bleeding will stop. But in the first 6 months you may have prolonged cycles and irregular bleeding, though usually lighter flow.