Birth control ! 😱

Stephanie • 19 💕 mother of a son 👪
I have an appointment Monday at planned parenthood for birth control , I'm 19 with a 9 mo old son 👶🏽 but I don't know which to get and I'm terrified of side affects 😖 ! 
I want the implant so I can be clear for 3 years but I'm not sure ! Please help which should I get ? And which have less side affects ?