Drank 3 cups of green tea, brown discharge????

Im 13, have had white/yellow discharge for about a year 1/2. I read online about the green tea to make your periods start, i just wanna get it started instead lf waiting, all my friends have started and im sorta left behind. So anyway, i bought some from the supermarket and drank around 3-4 cups yesterday, after the 1st cup i started having brown discharge in my underwear. I thought id pood my pants but it wasnt because very disgustingly i know, i smelled it and it smelled like normal discharge. I went to the toilet later on that evening after my 3rd cup and i saw pink dripping down from my vagina so i wiped and there was light pink on the tissue? The strange thing is, that morning my discharge was perfectly normal, also, its still here this morning? Are my periods about to start and when? By the way... I think the greentea does work