It's been a while since I've been on Depo, but when I got it, I had some bleeding. Then, once it was time for my period, it didn't come.
I used the deposit shot for a long time before getting pregnant, and the first shot stopped mine until I went off the shot. Then, it took 2-3 months after the "missed" shot for my cycle to return.
As soon as I started my period stopped! It’s also been a few years since I was on it, but I didn’t have a period the whole time I was on the shot. I was on it for over three years. I stopped because it started to give me migraines, so just watch out for side effects!