Levonorgestrel
"Hi! I am 35yrs old, no kids and after many years on jaz pill I wanted to have less hormonal impact. And of course every woman reacts differently so you might be someone with no problems at all. Insertion didn't work the first time since I had bad cramps due to uneven cervix. Next time the doctor prescribed a vaginal pill softening the uterus. That helped a lot with the cramps. I had several days with cramps afterwards but equal to having bad mentrual pain. It was uncomfortable but tolerable. 

On Skyla for 6 weeks now and have had light to heavy spotting since the insertion. Weight gain and irregular cramps. Will wait another few months to see if it gets better before having it removed. Wanted to love it because of easy use and less hormones"