Levonorgestrel
"Periods were very irregular and heavy for me so I decided to get on birth control to regulate. I decided with the IUD and being a virgin, I didn't think twice about an insertion into my uterus. 
The procedure as a virgin was the WORST pain I've ever felt. I immediately had severe cramps after (which was expected) and had horrible hunch over cramps for the rest of the night. 
LUCKILY, this all went away the next day and I am not bleeding or have any issues at all. I do recommend this to others but for virgins, please be mindful that  someone is inserting something into your cervix."