Etonogestrel
"Got the implant in July 2014 after giving birth to my daughter. No period and no bad side effects until June of this year when I stopped nursing. Then began the random bleeding (for anywhere from a few days to weeks at a time). I have gained weight about 10lbs, but I'm not entirely sure if that is from Nexplanon or no longer nursing. All in all, it's not horrible, but I really don't like bleeding all the time!! I've been thinking about having it removed, but we plan on trying to have another child late this coming spring, so I'll probably just try to hang in there a few more months before having it taken out. It is effective!"