Levonorgestrel
"I am 24 years old, have had one child.  I got the Mirena put in about 9 weeks after delivery which was one week ago.  Didn't hurt at all. My doctor did use numbing spray on my cervix though.  After I left the doctors I experienced slight cramping and have continued too off and on for about a week now.  Spotting is slight and more of a brownish discharge then actual blood.  I have also experienced some yeast like symptoms, itching mostly.  My doctor says that this could be because my body is still adjusting to the Mirena.  Otherwise I'm very happy and will post again in a few weeks."