I've been off the depo-provera for 8 months, i had irregular periods before that, i got my period last october and i get it every 2 weeks...whats wrong?

Depo and bleeding: Women who were irregular in their cycles before depoprovera are more likely to have irregular cycles afterwards - or even a span of "post-depo-amenorrhea, " i.e. No periods for a while. This obviously didn't happen to you, but you may be having anovulatory bleeding, i.e., vaginal bleeding not linked to normal ovulation. See your doctor if this doesn't straighten out.