"i am currently on my fifth year on nexplanon. when i first got it implanted. i noticed that i gained alot of weight. within the first couple months i noticed my weight jump to 30lbs. i have struggled with my weight i questioned my doctor. who said it doesn&#039;t cause weight gain. then when it was time to renew my implant i gained and additional thirty pounds!!! after that i told my doctor i was told to change my diet. i did lose 30lbs. by exercising and eating less but it was a struggle. i am stuck at the first thirty pounds i dont have periods with this birth control at all! after talking with a friend of the family she did say that nexplanon indeed caused weight gain. she had a similar experience. i&#039;m not pregnant i guess that good. i don&#039;t"