Any hormonal birth control can be less effective in overweight patients, though it isn't normally a major concern. I'd talk to your ob-gyn.

If you're on depo and your doc didn't say anything, I wouldn't worry. Your doc knows your weight.

so theres a chance? oh great

If a doc prescribed you with depo, you're fine. It's not an issue. Doctors know the risk, and doctors know how much you weigh. If it was an issue, the doc wouldn't have given it to you.

yes but i've put a few pounds on since then and especially around my bottom, i'm worried if i have the next injection in my bum its not going to be absorbed properly.

talk to your doc about it!!!! he/she is the only one that can ease your mind

It's over-all weight that determines the risk, not weight in one area. And you get it in the bum!? Oh god, is that the normal injection site lol? I haven't gotten my first one yet.

If you're really concerned than ask the doc next time you're in, but honestly I wouldn't worry too much.