Hi,
I had the Mirena for 6 months. I bled for 5 months and on the 6th month it had dislodged and was sitting in my cervix (I could feel the shank of the Mirena and the strings). In the 6 months my AF did get lighter as time went on but I had constant bleeding in between that needed a normal pad not just a panty liner. I was told it was normal to bleed for the first 6 months and feeling the strings. I also had pain but I thought it was from the Endometriosis I suffer from.

Hope I have helped. :^)
Take care
Chris