Taking Birth Control is the key here. As long as you have not missed taking any of the BCP you are 99.5% protected from pregnancy.
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
yes.
Yes, if the ejaculatory fluids came in contact with your vagina you can get pregnant.
Yes.
yes
Yes, that's how pregnancy usually starts.
The same as anyone else's. If you do not wish to become pregnant always use a condom and/or a reliable form of birth control.
yes because the condom could break
Condoms are a good source of contraception if you use them properly, and they do not tear/break. If the condom didn't tear/break then, even if they did ejaculate inside you, there is very little chance you would get pregnant.
There's a chance. You should probably go see a doctor and/or get a pregnancy test. Also, if you're not pregnant, you should consider carrying a condom/ start using the pill. Assuming you're not trying to get pregnant ofcource.
there really wasn't much information for an answers. but here we are: if he ejaculated inside there is a chance, if he was wearing a condom and ejaculated there is a small chance, if he didn't ejaculate there is basically no chance.