I got mirena in June, I was on the depo shot right before the mir...

I got mirena in June, I was on the depo shot right before the mirena but had put on 20 pounds so decided to go with mirena. I think it hurt like hell putting it in, but after like two days it was okay. I have never bled with the mirena, but my periods were already gone anyways b/c of the depo shot. I am having a problem with weight still. I don't know if it is b/c the depo is still in my system or if the mirena is contributing. Other than that it works pretty good for me. The thing that scares me is that It seems like a lot of people didn't have bad symptoms until later on. Should I just remove it now and save myself from all that?