Pregnant on the Pill ? πŸ’Š πŸ’Š

What causes people to become pregnant on the pill? I just started & want to AVOID anything that causes people to end up pregnant. Brands, medications, mistakes ETC ! 😰😰😰

Also, does him cumming inside you have any chances of increasing pregnancy or no because I know probably like 80% of girls let them cum inside them if they’re on BC. idk if I plan on doing that yet, but can that increase the chances of becoming pregnant?

Please share everything you guys know, thanks! I think it will help not only me but a lot of other girls as well. πŸ’•πŸ’•πŸ’•πŸ’•