"i got my kyleena iud inserted about 4 months ago. i heard very mixed experiences on whether or not insertion hurt - and for me it was extremely painful. i had pretty bad cramping and had to avoid exercise for about 3-4 days after insertion, which wasn&#039;t too bad. for the past 2 months i have been experiencing the worst cramps ever that come at very random times. i have never given birth before, but i often think that these cramps must be what contractions feel like. i&#039;ve had ultrasounds and i have been told that the iud has not shifted or anything, so the cause of the cramps is unknown. i&#039;m hoping they go away because i don&#039;t know how long i can take it!!"