"i got the mirena two months ago. it hurt a little when the doctor put it in, and i cramped for about a day afterwards. i had no discomfort after that until i got my period a month later. my period was 2 1/2 weeks long (which has never happened in my life) with weird discharge and a lot of cramping. the main issue i&#039;ve had with the mirena is a lot of cramping and brown slimy discharge. i&#039;m hoping it gets better, my doc says to give it some time."