Mirena
"I had Mirena inserted 6 weeks ago.  I have never had a child, and I'm 27 years old.  I chose Mirena because I was starting to get bad side effects from birth control pills.  The insertion process was very painful.  I had only taken a few Ibuprofen and didn't take any medicine to help ease the cervix.  During the process my cervix did bleed, and my doctor put some medicine inside to stop the bleeding.  I'm still experiencing cramps.  At first it was constant, severe pain.  But now I get severe cramping like 2 times per week.  I'm guessing my body is still trying to get used to it."