IUD cramps after sex?

Ly
I got the Kyleena IUD placed 5 days ago and it didn't hurt too badly at all and I don't have cramps randomly during the day, but when I have sex, I have cramps the morning after and they last for 4-6 hours. They're so bad that I feel like vomiting. Has anyone else experienced this? The nurse told me to take some ibuprofen and lie down but it's not working.