Levonorgestrel
"I'm a 20yr old woman who has never had kids and I'm here to tell you how to get an IUD so you don't have a terrible experience like some of the people who rate this drug badly
Don't listen to the bad reviews!
They will just freak you out, plus complications are extremely rare, especially if you ask the doc (not a nurse) about his/her personal stats. Side effects like moodiness, weight gain and acne are impossible! Less than 1% of the drug gets in your blood stream so it can't have the same side effects as most birth controls
The cervix softener and ibprofin really help with pain while lorazipam helps relax your muscles. Make sure you take them! 
It will hurt like a strong cramp, but it is brief and worth the 99.7  protection plus no periods"