chance of pregnancy?

So i’ve been taking combination birth control pills for about a year and i’m sexually active with my boyfriend. anytime we have sex we use a condom and still pull out and i’ve been on the pill. my prescription is over after this month so i’m not going to be taking birth control anymore due to its side effects, but i’m still going to be sexually active with my boyfriend. So i guess the only methods we will use everytime is a condom and pulling out with the condom still on. Is this safe? i’m only 17 so i’m nervous about having sex once i won’t be on the pill anymore but i hated the side effects and birth control isn’t for me.