Which protection is the best from getting pregnant?

Hey there, I'm (F21) in a relationship and I've been using birth control for 6 months already. i'm getting concerned that pills will effect my health and fertility in a long term. My boyfriend tells me it's very normal and common among girls in a relationship and I shouldn't worry about it if I take good pills as my doctor prescrobed.

I just want to know what type of protection do you use and what is the best?