I have had the Mirena for almost a year now had a period for about a month when first put it in had trouble with that because they had to push past a fibroid they didnt realize was there. The a few weeks ago I had terrible stomach cramps for almost a week then on Feb 23 I had a very heavy period out of the blue (havent had one after that first month) I am still spotting and it is March 10, 2009 (enough to have to wear a panty liner) I have checked for the string and I think I feel it but it almost feels as if it is behind a thin layer of skin. I am wondering if I need to see my doctor.