Levonorgestrel
"I've had Mirena for 4 months now and I love it. I've read so many stories about the excruciating pain women have felt during insertion, but for me it was no worse than a period cramp and it didn't last very long at all. By the end of the day I was back to normal. There was some light spotting at first. I love that I don't have to remember to take a pill every morning or else I'd probably be pregnant again. I would definitely recommend it."