Depo sound out. . . please sustain?

i was on the shot for something like a year and a couple months...i stopped getting the shot in october but i still haven't gotten my extent back how long does it lift for it to come back? and should i be worried that i might be pregnant? I took the Depo shot, and have nothing but problems next to it ! I think it messes your unbroken system up. I bled for 35 days straight and then for going on for 15 more off and on. And if you have unprotected sex while off the shot, in that is a high haphazard that you are pregnant. A friend of mine became pregnant in 6 weeks of being of Depo.
Rumor have it, that it takes up to (or even exceeds) a year to acquire your cycle back on track.