Etonogestrel
"Was on depo for a year prior to switching to nexplanon in 2012. For the first 2 and half years there were no periods. The the last couple months of the 3 years however unpredictable periods started of varying durations of up to almost 3 weeks. Next insertion will probably be a few months before the 3 years to prevent the bleeding. New implant stopped the bleeding. No problems with weight gain or loosing weight on Nexplanon."