"i had kyleena inserted two days before my period. i&#039;m not going to sugar coat my experience. the insertion was the most painful thing i&#039;ve ever had to go through. my doctor told me i would feel some slight cramping, but instead i had the worst cramps i&#039;ve ever experienced. i also almost passed out during the procedure because the pain was so bad. i ended up hanging out in the room for a few minutes before i could even move around. for the rest of the day, i had very bad cramps. the second day was a little better. on the third day, i got my period and also had very bad cramps. at one point i was driving and had to pull over because i was in so much discomfort. my period then lasted for 12 days. i had mild cramping and moderate back aches."