Levonorgestrel
"I'm 40 yrs old and never had kids. But after heavy vaginal bleeding for over a month and a D&C with polyp removal my OB/Gyn and I decided it was time to consider birth control.

 I have never been regular since I have PCOS and have tried oral BC to help this but it never worked. I would bleed at least 3 weeks out of the month even on the pill. Because of this the IUD was a better option. 

Insertion was not bad. Very much like a Pap smear, there is mild discomfort. Word of advice take at least 800 mgs of Ibprofen an hour before you go and have it insterted during your period. I didn't have anyone take me, but I would say go home and lay down after. I went immediately to the grocery store and became lightheaded there."