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Typically no. Your mucous membrane is swollen. Be sure to tell your friends parents and especially your parents, what happened, so they can monitor you. The only way to be sure is to go to the doctor. If the bleeding stops right away, you probably do not need to worry. If it doesn't, seek medical attention because you don't want to lose a lot of blood.

No, nosebleeds aren't very serious. just pinch your nose at the bridge hold a tissue to it. When you spit up the blood it just means that its going from your nose to the back of your throat and thats completely normal. the longest it should last is probably 5 to 10 minutes.

no this is fine i have nosebleeds all the time and the only reason you spat blood is because you snorted it through your nose. it may have started bleeding because of the dry room just try to breath through your mouth and not so much through your nose and it should stop nothing to worry about though :)