Etonogestrel
"I got Implanon 3 months ago. Even with an above average amount of bruising after insertion, it only hurt when I put weight on my arm and it only lasted for a few days. I got my period a few days after insertion.  It lasted 7 days and was fairly heavy for 5 of those days.  This made me nervous that I was gonna be one of the unlucky people who never stopped bleeding, but it's been over 60 days since I've had any bleeding.  So if you do have some heavy bleeding at first, that doesn't mean you will bleed the entire time you have it. That was my biggest concern before getting it. I have no negative side effects and it's so much more convenient than pills.  My experience so far has been fantastic!"