Excessive weight gain with Nexplanon?

Delaney
I'm desperately looking for a new birth control method...I used to be on the pill but I always had a lot of nausea, headaches, and backaches when I took it... Plus I'm like super forgetful so that didn't help too much either🙈
I was thinking about switching to The under arm one because of how low maintenance it is, HOWEVER I keep hearing that it makes you gain a lot (I heard 8-15 Lbs!!!) of weight...which I'm not really excited about.
 Is this true ladies?! I need insight and quick!!!