"i had my mirena placed 2 days ago. i had very mild spotting that started about 4 hours after i got it done and only lasted 10 minutes or even less. i have cramps like you would a normal period. i&#039;m 27 years old and have a 14 month old daughter. we want to wait to have another one until she is potty trained. i got this because i got pregnant with her while i was taking the pill. when they put my mirena in it did make my eyes water a little bit but then it was done ...and i felt great afterward. i&#039;m happy i didn&#039;t need to worry anymore. hope this helps ease the stress."