"i was 16 years old when i got my implanon in may 2009. i am now rounding up to my 3 year removal period. i can honestly say i&#039;ve never been happier with a birth control. i don&#039;t have to remember to do anything! i weighed 103lbs then; i weigh 107lbs to date. i would safely say that the implanon did not cause the weight gain, that time did. i do experience breast tenderness around the time of my menstrual period (which by the way is regular.. 3-5 days a month) and that only lasts as long as the menstrual cycle itself. the one bad thing i can say about implanon is that is has severely decreased my sex-drive. overall i&#039;m happy."