Yes, you can
Yes. If you are having unprotected sex then yes you can get pregnant.
It's unlikely but not impossible.
If you have unprotected sex while you were on your period yes you can get pregnant.
If you are having your period at the time of sex then you are not currently ovulating and you would not get pregnant.
The short answer is yes. If you have had unprotected sex you could be pregnant.
It is biologically impossible to be pregnant whilst having a period.
It is unlikely but not impossible. Spermatozoids can live through the period duration.
It isn't really possible to get pregnant while having a period.
You can't get pregnant while you're having your period.