Levonorgestrel
"I've been on Skyla for about a month and a half now. I am 18 years old and I've never had a child before. I use birth control to regulate my periods and cramps. Getting the IUD was very painful. I nearly fainted. Definitely have someone take you there for the procedure. I was painfully cramping the whole day after it was inserted. I continued to have cramps for nearly 2 weeks after it was inserted and I still have minor cramps occasionally though much more manageable.  I was spotting for nearly a month but it has stopped now. But when I get wet the fluid is more sticky I would say. I was previously on 3 month birth control which greatly decreased my sex drive but now I would say I have a sex drive appropriate of someone my age"