Birth Control options

Hi so I’ve been dating my boyfriend for about a year and a half now and I’m in high school, we both want to have sex and since we’ve been dating for so long I think that’s fair. My problem is, I come from a very conservative and religious family and I don’t have access to the pill. But if We use condoms, pull out method, and I keep track of when I’m most fertile and plan around that, is it enough? I’m terrified of getting pregnant but at the same time I love my boyfriend and I’d like to take things to the next level. Thanks for reading and your possible advice <3