Levonorgestrel
"I have now had my Skyla for over a month. I was on the pill before and had to switch due to migraines caused by too much estrogen. Insertion wasn't bad-if anything just a little cramp added to your normal pelvic exam. After insertion I was very dizzy and super nauseous. I laid there for about 25 mins feeling sick and having terrible cramping. Soon after I was fine! Mild cramping for the first few days and then for the next week (lessened over time). I bled for about three weeks after insertion- different everyday. Sometimes more than others. Just had my first cycle while on Skyla. Very light, but lasting about 7 days. had a few breakouts but may be stress related too. Feeling great so far!"