Levonorgestrel
"I had skyla inserted 4 days ago. I had read reviews online and prepared myself for the worst! I felt one small cramp when my doctor put the speculum in and zero pain after that. I couldn't believe when she said she was done! I admitted to her I anticipated what the Google reviews had said and she laughed and said "well those women didn't have me insert theirs! That's why I took longer prepping!" She has a great sense of humor so don't over analyze her comment! I had such slight cramping for maybe 3 hours, literally nothing compared to period cramps and spotted on and off light brown for one day... Didn't even need a liner. I can't feel the iud, have zero cramping or spotting now and am so happy. Also, I was not on my period during insertion"