Implant?

I've been on the implant bc for about a year and a half. My periods will last up to 3 weeks which my doctor said was normal but it's so frustrating and annoying.. I also feel like it may be the reason I've been getting yeast infections! Has anyone else had these problems? Did they go away? Does it get better or should I just look for a new method? I feel like with all these problems it might not even be worth it!