Irregular periods...

I've came off Depo Provera, the contraceptive injection for over a year but my periods are completely out of wack. I have my period twice a month and this hasn't shown any signs of change. I know that when you come off a contraceptive it can take a while for your body to get back in sync but I'm beginning to feel like something's went wrong because I'm not returning to my regular period... Should I wait it out for another year and see if my period gets back on track? Or see a doctor? I don't know if this is normal...