Period changes while on depo?

So i've been on the depo shot for about a year now. As far as I can remember, i've bled continuously for months at the time to the point where I always needed to wear panty liners and pads. I was always on time to get my shot. Since my last shot in late february, i haven't bled much at all. It's weird honestly, I was so used to having a period everyday and it put my mind at ease knowing I couldn't be pregnant if i was bleeding that much.
One of my friends has been on depo months before me and said her period just stopped, and now she gets her period every three months.
Is it possible for my body to stop bleeding since my last shot? I have no pregnancy symptoms like tender breasts or morning sickness, but i'm sexually active and we don't use condoms but i need a second opinion!!