Why do females get their period when they're pregnant?

Can you get pregnant when your on your period and they nut in you..??

Can you still be pregnat if you get your period?

Is it possible to get pregnant the day after your period is done.?

Can you get pregnant 11 days before your period??

can I get my period while im pregnat or no

Can you still get pregnant while on your period if the guy cums into you?

does brownish red discharge mean your prego? or is it just a rare early symptom of your period?

Can I still get pregnant with a period every 17 days? I've had a misscariage 5 months ago?

Can you still be pregnant if you get your period?? Like if I gets really short or light or something... help!!!

Is it possible to get pregnant a week or two before your expected period?