Quoting ℳary ℐane:" I see it. when is your period due?"
See, that's the thing. I think I lost my Mirena IUD because I didn't have a period for months and then BAM! I had a massive one along with terribly sore boobs and bad lower back pain (which I still have now, days after my period is gone) so I called my GYN and he said it sounds like I lost it and I experiences withdrawal bleeding. I go in soon for a checkup to see if it's indeed gone.