Some people can have their period while being pregnant but its very uncommon. It would be short and light from what I understand if you are pregnant and still recieving your period! You can just take a blood test or just a reg test to find out! Good Luck Either way!
Technically it wouldn't be a period if you were pregnant, it would be some kind of light bleed or spotting and not like a normal period. If you think you might be pregnant, best to wait until your next period is due and if it's late get a test.