Levonorgestrel
"I just got my Skyla yesterday morning. I love it so far. I am 20 and I took birth control in the past but I wanted something more reliable/did not have to keep up with daily. I did not think the insertion was that painful. My doctor said I handled it very well compared to other woman. Towards the end it was painful but it was tolerable. Just stay relaxed and remember to breathe and you'll be fine. I had a little spotting within the first few hours but after that I stopped bleeding. I had cramps yesterday and I seem to have lower back pain today but pain reliever helps with that."