Levonorgestrel
"Ok I've had my IUD in for about 3-4 weeks now. I got it in off my period, with no misprostal and no cervical block. It was brutal but I survived. Didn't cramp afterwards, didn't spot afterwards, totally normal. I was thinking maybe (for once in my life) that I got lucky and wasn't going to have a traumatic experience.

Wrong! I'm on my first period since getting it, have been bleeding heavily for over a week now and my period cramps are HEINOUS. Like it feels like insertion pains all over again. I'm starting to worry it has expelled itself or latched onto something its not supposed to be latched onto. I've been on the couch sobbing from the cramps all day."