Implant?

So I'm on the pill but I'm really bad at taking them. My mom suggested I get the implant, but I know nothing about it. Only thing I know is that you don't have to worry about it for three years. I personally would prefer the shot because I don't like the idea of something being in my arms, but I've heard really bad things about the shot like it causing infertility and women gaining alotta weight and some bleeding for months at a time. So what are yalls thoughts? Some insight and shared knowledge would be greatly appreciated too.