Could it be anything excluding my first spell?

I have only just found brown stains on my underwear ever since this morning. It is probably most likely my time of year, but could it be a sign for anything else?
I'm 13 and extremely short (4"10). I have small "buds" and i enjoy recently be developing pubic hair for 2 months. I thought period happen effective the end of puberty. Could the blood penny-pinching anything else? Ugh, I jREALLY don't want to have my time of year, and i'm praying I don't have it right presently. It probably is your period. Go tell to your mom. Don't wait another time to find out because it might get heavier and you could stain yourself. Don't verbs, when I first got mine I thought that too-- "ugh i aversion this i don't want it" but you get used to it. :)
i deduce it is only a time