yes. you can get pregnant straight after it.
Possibly, yes. It is very unlikely for a woman to get pregnant 7 days before her period as menstruation happens about 14 days after ovulation - 7 days after your period is more likely to result in...
Yes. Counting days is very unreliable as a contraceptive. 1 out of five women using that finds themselves pregnant within one year.
Yes you can, actually. It is rare, but it can happen. You can get pregnant any day. Again, rare, but possible.