Late period: gained a pound out of ordinary. does it mean its coming soon?

my periods late about 10 days, and i think its due to the fact that ive been exercising a lot lately. ive been consitently losing or remaiing the same weight for the last week and a half ive been doing it. but i suddenly gained an extra pound this morning, when i didnt change anything about my regimen. do you this means that my periods coming tomorrow, or soon? ahh cause i need it to come soon! [btw im only 15, so its not too weird for it to be affected and irregular, and im not pregnant]