"i got the nexplanon in nov 2013. it is definitely the most effective and easiest form of birth control i have experienced. the first 3 months i had some spotting &amp; break through bleeding. then after 3 months i quit having periods. i have to admit that part is nice! however, i have gained about 25 pounds, averaging 10 pounds per year. i work out on weekends, eat healthy and do what i can to control it but it seems to have minimal impact. i have always been thin. i&#039;m 5&#039;9.5 and had been approximately 130-135 for the past 8 years. now i&#039;m between 155-160. also the weight i have put on makes me look pregnant.i have been more mellow and my sex drive has drastically lowered."