Etonogestrel
"I've had nexplanon since October, about 4 months. I love it! The insertion was super easy, the shot to numb my arm was the worst part. I had moderate brusing but nothing super noticable and no soreness afterwards. 
I have not gotten pregnant on nexplanon which is the main goal of getting it. I also haven't had a period since I've had nexplanon inserted. No spotting, no bleeding, nothing.
I've heard of long term bleeding while on nexplanon, however my gynecologist said usually that can be cleared up with a side of the birth control pill."