Period pill pregnancy

If you’re on the pill, and happen to become pregnant

Can you still get your period?

I’ve had my period each month and it’s been normal (currently have it)

But my friend recently became pregnant so I have a subconscious scare that maybe I’ll become pregnant too (even rho she wasn’t on birth control) and I use protection with my boyfriend basically all the time

How will you know if yourepregnant while on the pill?