Etonogestrel
"I had my Nexplanon put in February of 2013. I had normal periods Feb-April and then nothing until July. Then it lasted about 10 days, which is long for me. I didn't have a period or any spotting at all until now in March 2014. It's been about a week now so I'm curious to see how long it will last. I've gained about 5-8 pounds but it could be other environmental factors. My acne has flared up during this period but I've never had great skin and it's not worse than normal. I like Nexplanon quite a bit, the rod never bothers me and it's very convenient to not have to take a pill."