Levonorgestrel
"I had skyla inserted a year ago. Having it inserted was not pleasant. There was some heavy cramping and I was bleeding/spotting for the next two months or so but since then my periods have been light if I have them at all my acne has almost completely cleared up. I have not gained any weight, I have lost some (though not on purpose). Besides my partner sometimes feeling the strings and some bleeding during sex, as well as some painful cramping from time to time it's been good. No kids yet haha."