Body changes

I know copper IUDs don't contain hormones and sometimes after coming off the pill your body changes as well as changes when starting any kind of birth control. How much did your body change? Are you happy with it? Why did you start an IUD/stop the pill?

I'm seriously considering an IUD because I don't like the way the pill changed your body with things like weight gain, increased breast size, etc. I've been on the pill for.... 3 maybe 4 years. I can seem to get the weight off either... plus I have a genetic predisposition to mouth ulcers and the hormone changes cause some of the worst I've ever had so I just want to know your experience