IUD weight gain

Have any of you gained weight from the IUD? I've gained 30 pounds since getting it 5 months ago. I excercise regularly, have been eating healthier, walk about an hour to and from classes every day in addition to my work out, and have even tried Plexus. Nothing works. I can't get rid of this weight and I hate it. Has anyone had this problem and what did you do to resolve it? I'm getting married soon and I don't want to look bad on our big day.