He knows. And, even if he didn't there is sperm in the pre-ejaculate so yes, you can still get pregnant.
Yes, this certainly is a possibility.
It is possible that you could get pregnant from this. And if you don't, it doesn't mean you can't get pregnant. There are a lot of different things that make a pregnancy happen and it takes most couples around a year to conceive
Not unless you had no barrier when you ejaculated into her. If you had the condom on and ejaculated into the condom while you were inside of her, then exited her and changed condoms (unless the condom broke) you could not get her pregnant. The only way for her to get pregnant is if you ejaculated into her or emptied your fluids into her (and most condoms have spermicide). If neither are the case, it is nearly 0% chance that she could get pregnant.
Yes, that's how pregnancy usually starts.
Possibility
yes
Yes you can ovulate at any time.
She certainly can not get pregnant from swallowing sperm. sperm needs to be ejaculated in the vagina for that to happen.
Anytime a man ejaculates inside you there is a chance you could be pregnant, even if you are menstruating.
there could be a possibility but it is very much rare to get her pregnant.
Yes, there is very little needed to get pregnant, if it does happen, the excess will flow back out of the woman.
Yes you definitely could become pregnant. You would be very fertile around this time.