I had my Mirena out last friday. I have noticed the swelling/bloating is going away fast! Noticed a difference after 1 day! But I too, have this left side, weird nagging pain. Not a pain that like makes you double over, but just enough to annoy. It goes into my low back, and hip too. Not sure what it could be. Anyone have any ideas? Maybe ovarian cyst? Is there anyway you can tell if you have one of those?