"i am 21 years old with nexplanon i have gained a significant amount of weight, i am 5&#039;11, i went from 155 pounds to 190 pounds in a span of 2 months. it&#039;s been incredibly difficult to lose weight i strictly drink water and monitor my calories. it&#039;s been an absolute nightmare, i have no idea how i could&#039;ve possibly gained so much weight, my metabolism has never been the same. i rarely get my period which is a plus, and it does it&#039;s job but the weight gain is miserable."