"i had mirena put in about 6 months ago. i am 20 and have never had kids. the reason why i chose mirena was basically because i could never remember to take the pill. i have had no weight gain or mood changes. when it was inserted it was pretty painful but it only took a few seconds. i spotted slightly for the first few weeks and had some pretty intense lower abdominal cramping if i wore tight pants that would only last for a few seconds. but after about a month, everything was back to normal. the benefits of mirena totally outweigh the discomfort in the beginning."