Condom and pullout method

I had sex today with my boyfriend and he used a condom and pullout method. What are possibilities of me getting pregnant?? And to make super sure I was considering getting plan B but I’m not sure how serious this situation is for me to get a plan B. I’m also scared of taking plan B because I’m worried it will mess with my ovulation.

Can someone of wisdom please educate me and give me their opinion ? 😫