discontinuing depo shot! PLEASE HELP!!!!

Elise
If you've been on depo before you know that it stops/lessens the frequency of your period. I decided  to discontinue my use after a year.  I was supposed to get the shot earlier this month and I'm just wondering how long it might take for my period to come back and get normal again? Can anyone help me out? I've been a little freaked out because I usually start to bleed when I'm due for another shot but I didn't this time. I took two pregnancy tests and both were negative but I'm still paranoid lol please help!