A period is the shedding of your uterine lining and unfertilised egg each month. If that egg is fertilised then you're pregnant - hence why you can't have a period. Some women have vaginal or other bleeding but it's not a period.
Well my sister had two kind of heavy periods at the beginning of her pregnacy. And the baby was fine and norhing was wrong. So it is very possible.
yes it can you can still bleed and be pregnant verry common.
Nope - it's not possible to have a period and be pregnant. Some women experience light bleeding or spotting in pregnancy and mistake it for a period, but it;s just vaginal bleeding - not a period.
If your period has been continuing like normal then you're not pregnant. If you've been sexually active and experience irregular/missing or light bleeding then it wouldn't hurt to take a pregnancy test just to check.
Some people can still have a period during the whole pregnancy. But it would usually be lighter than a normal one. I dont think its common though.