birth control
"I have had the Mirena for 10 months now.  I have had to go back to the Doctor because my Mirena fell out of place.  They said the string to your Mirena can sometimes get tangled up with a tampon and when you pull the tampon out the Mirena gets pulled out of place. I have had my period ranging from 2-3 weeks each month. Also my husband can feel it during intercourse.  "