"i&#039;m 22, have never been pregnant, and had my mirena inserted ~3 weeks ago. other than some slight cramping during and some moderately worse cramping later that day and for a few days after (nothing pain killers can&#039;t handle) it&#039;s been great!  i used to have really heavy, really painful periods (which is why i went with mirena over the paraguard) and though i was supposed to get my period the week after they put it in i haven&#039;t had anything but super light, almost non-existent spotting."