I had just 2 shots, and it took me 5-6 months to get my periods back and then 9mo to become pregnant.
Depo can do some strange and crazy things to you so don't be surprised if it takes a short time or an extra long time. No one is the same after the depo shot. No matter how many they had.
BTW
Hope you stick around and post an intro of yourself! Love to have you stay and chat awhile!