Levonorgestrel
"I had the Skyla IUD placed a few days ago. Don't let the negative reviews keep you from trying it. The insertion didn't last long and the worst of it felt like a pinching menstrual cramp lasting a couple seconds (once when they measure the uterus and once for insertion). I did pass out twice afterwards (I'm weak when it comes to medical things). That evening I had some cramping but some ibuprofen and a heating pad took care of it. I haven't had any further cramping since and am only spotting a little bit. I will update if anything changes but I'm glad I didn't let all of the scary reviews I read change my mind about trying it."