Masturbate. If you are a child it may not happen until you are older.
At 12, you might still be a bit too young to produce sperm.
yes it does
If she arouses him, and makes him have an orgasm then yes she can.
Pregnancy requires that a sperm cell come into contact with an egg. So if the "something" has sperm on, or in it, you can get pregnant. Otherwise, no -- no sperm, no fetus.
No, sperm cannot make a pregnancy test come back positive. Pregnancy tests detect the presence of the hormone hCG (human chorionic gonadotropin) which is only produced by a developing embryo after implantation in the uterus. Sperm alone cannot create this hormone.
If you haven't reached puberty, then your body does not make sperm to be released, so there isn't really anything you can do about it, except wait.
Generally not.
Women don't make sperm. Only men do. Your question is not clear on what you want to know.
Sperm naturally clots even if not mixed with urine. The sperm clots in order to help make a "plug" so it doesn't come out of the vagina before some of the other sperm can have a chance to fertilize the egg.
All you need to do is keep masturbating through the little tingly pain :)
You may not be able to. Until you have matured sexually, you body does not produce sperm.
It would be theoretically possible, though highly unlikely to cause pregnancy.