I bled for 9 weeks after having the Mirena inserted. Think I had light periods for the next 2 or three months, then nothing at all. I usually have a very heavy flow and a long period (around nine days), so not having a period was bliss. Unfortunately, the hormones sent me loopy and I had the Mirena removed about two years after having it put in... once I figured out why I was such a fat, miserable cow!!