I was pregnant in July of 2009 but I misscarried than I decided to get on the depo shot on feb 1 2010 when I did that I bleed for all three months and decided never to go back for a refill which was do on may 3 2010 my last period was may 1 2010 and it was just a little spotting it's September and still haven had a period I went for my yearly on aug 26 2010 and I still haven't had a period!

You should call your doctor!

Talk to your doctor.. I am on depo and some times you bleed and spot, sometimes you don't, I have a friend who went on depo and didn't get their period once. I also heard after your off depo it can awhile for your cycle to regulate.