Levonorgestrel
"I've had my liletta for almost 3 months now and everything is great. The insertion process isn't pleasant but it was pretty quick. I'd say a 4 or 5 on a scale from 1-10 and but just for a minute. I had a lot of cramping afterward for several days and I felt light headed after the procedure (eat something before, take 800 mg of ibuprofen & stay hydrated!) 

I have had some irregular bleeding but it's been light & infrequent. Definitely manageable. I love having birth control that I don't have to think about! The only negative side effect that I've noticed is that my skin is more oily than before when I was on the pill."