3 years of unprotected sex question!!πŸ˜•πŸ˜¨

so I have been having unprotected sex for about 3 years now and literally just been using the "pull out" method (yes, I know it's not smart). And I have not gotten pregnant at all... it's a good thing and I'm lucky but I can't help but wonder if I can't have children or I really am just lucky?... any thoughts??