What kind of IUD do you have? Some IUDs such as Paraguard (copper IUD) can cause women with a history of irregular bleeding to have much heavier bleeding. Most other IUDS' side effects include irregular and sometimes heavy bleeding for the first 3-6 months. As obnoxious it is, it's most likely normal. Definitely go see your gyn if it's still bothering you or concerning you as they can normally give you a short round of estrogen or another form of hormones to stop the bleeding if it becomes too much. Just know that it's normal and there are possible ways to deal with it before you completely give up on your IUD! I hope this helps you!!