Pregnant??

I had sex yesterday and became a lil Oreo if Yk what I mean hahah I’m also on birth control pills and my period is due the next 1-3 days. I was wondering if I can get my period today or tmrw and still be pregnant or if I get It then I’m okay?? I know the likely hood of pregnancy is low bc Im on BC but i just wanna be safe:) thank you!!!!