It depends if the boy can ejaculate and the girl has started her started periods.
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.
Yes. Although the chances are lower it is possible. Pre-ejaculate still contains sperm. Use a condom to prevent pregnancy.
Yes. Pre-ejaculate still contains sperm. Although your chances aren't as high as from normal ejaculate, it is still possible. It is best to use a condom to prevent pregnancy even from pre-ejaculate.
If there are sperm in the condom the woman could get pregnant.
There's a 25-75 chance favoring that you would not get her pregnant. You could use a condom and not get her pregnant, or you don't use a condom and you have a chance at getting her pregnant.
after the mences. day betwen 14 to 19.............
Yes you can. Even of you don't ejaculate you can since pre-ejaculation has sperms as well.
No; in fact having your period shrinks your chances of getting pregnant to almost zero. Still use a condom though.