Yes! A girl can get pregnant from potentially any unprotected sex act. You should not be having unpotected sex!
Depends on a bunch of different factors. Is the girl on birth control? Is a condom being used?
A girl can get pregnant any time if she is ovulating.
If it's unprotected sex, yes, absolutely... or if the girl is on the pill and isn't consistent, there is also a high possibility. Take a home pregnancy test if your period is late. good luck.