I'm sure you have already been scolded by your gyno for not checking for the strings monthly in the first place, but have you EVER felt the strings? Did you suddenly stop feeling them? My Mirena was placed improperly and I never felt the strings at all, but the Dr. was able to see it, and she plucked it out with forceps, are you sure you did not lose it already? has the gyno done an ultrasound to locate it, to make sure it is even still there? Now, if you read the warning package that came with your mirena, it says this is a common problem, so take a deep breathe and you will be fine, it will cramp like a bugger, but you will be okay. I can't imagine it being as bad as the D&C you get after a miscarriage, so don't be so scared. Good luck with this, and if you use a mirena again, ask the Dr. how to check the strings properly, no one ever showed me how,it's a wonder I wasn't pregnant is what my gyno told me!