"i got nexplanon in nov. 2016 i was 107lbs now in may 2017 i weigh 145lbs, i have not changed my eating habits from before nexplanon. i have tried cutting down on how much i eat and eating healthier and my weight hasn&#039;t gone down at all. i have had a period going on 4 months now with extremely painful cramping. nexplanon is the worst birth control i have ever had."