Etonogestrel
"I got my Nexplanon in December 2013. Two weeks after I got the implant I began bleeding. But not so much bleeding as heavy spotting. And it has lasted for months. It'd disappear for only a few days at a time and come right back. I think that's been the worst part. Now in June 2014, I think the spotting is starting to subside. Thank goodness. I've read a lot of reviews of girls saying they lost their sex drive. I think mine actually increased. I've also gained a little weight. 5-10 lbs. My breasts grew too. And they're tender a lot. A new side effect that's gotten pretty out of control lately has been my mood swings (I cry over any little thing, I'm emotional about EVERYTHING) and the nausea (NOT FUN)."