Should I get more than one birth control method

Sara
I hear that condoms alone aren't as effective in the charts/polls, so I've been considering getting the pill - but I can't really bc I'm too young and poor and don't want my parents to know, but the thing is that my boyfriend rarely cums- and if he does he pulls out w/ condom. Should I still be worried about my risks? Can you get pregnant via foreplay? Like I always get worried that there's precum everywhere. And my sister also tells me I'm going to hell or getting pregnant as divine punishment, I'm so scared its gonna happen.