You know what I didn't experience much problems whilst on depo and had no bleeding whatsoever, once the 3 months was up I had so much pregnancy symptoms which is apparently the side effects of it wearing off. It can be hard ttc after it as your periods can take ages to return, thankfully mine came back 9 months after my shot, it felt like ages and now starting to regulate. I think depo should be for those who are 100% sure they don't want another baby any time soon.
I think I'll probably never go back on birth control, I'm just worried it will ruin my body!