"i have tried every bc out there and my body has rejected them all. even the iuds dislodged themselves within three days. got the nexplanon about a month and a half ago and i have had very unstable mood swings. i&#039;m a hardcore fitness person so my body fat was at 10% when i got this and it&#039;s made me gain 15lbs. my bleeding won&#039;t stop been two weeks and my cramps have become worse and lasted a whole week. worst experience with birth control."