Birth Control Without Protection?

Recently have been having sex with my partner without a condom. Although we had been cautious about sperm, today we did not use any pull-out method. I've been on birth control for almost two months now, and I'm not as knowledgable as I should be. I won't get pregnant with this, correct? Does it matter the amount of sperm and the amount of times we do not use a pull-out method? If there's any other tips and tricks to know of BC, let me know!