Strange Period Blood Period Blood Is A Strange Color...?

Period blood is a strange color...? - strange period blood

I am one years seventeen years, I have a regular period, I started my period today, and instead of my blood is red, brown hair. I understand that sometimes at the beginning of a period, blood is sometimes a reddish-brown, but it was a very dark brown. Should I worry or is it normal, just at the beginning?

Thank you in advance.