Losing weight on the Implant

Okay, so I'm on the Nexplanon implant and have gained about 15lbs since having it. It's been a little under a year since it was placed. In the past 3 years I've already gained a tremendous amount of weight due to depression and such. Then I started losing weight again, then got the implant, and gained some weight back PLUS about 15lbs🙄😥 I'm about to go get a gym membership tomorrow but was wondering if it will even be worth it?? Is it hard to lose the "implant weight" or any weight at all with this thing? What are you ladies experiences with the implant?? I need to lose this weight! I hate the way I look. I used to be fit and played sports. Now I'm almost 220 lbs, when I used to weigh 135 lbs. PLEEEAASSEEE HELP!