Using just a condom

Li
So I've been sexually active for about 3 months and our only form of protection is a condom and plan b in case one ever breaks. Would most people consider this enough protection? We are very careful to always use condoms correctly and make sure no spills or leaks but what are the odds of us missing something where we should have taken plan b but didn't. Do most people think this is good enough or would never do it with so little protection. This could just be me being a little paranoid Idk...