"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&#039;d disappear for only a few days at a time and come right back. i think that&#039;s been the worst part. now in june 2014, i think the spotting is starting to subside. thank goodness. i&#039;ve read a lot of reviews of girls saying they lost their sex drive. i think mine actually increased. i&#039;ve also gained a little weight. 5-10 lbs. my breasts grew too. and they&#039;re tender a lot. a new side effect that&#039;s gotten pretty out of control lately has been my mood swings (i cry over any little thing, i&#039;m emotional about everything) and the nausea (not fun)."