Period's blood is brown and some times red is this bad?

The brown blood may just be because of oxidation of the blood outside of the vessels if there is no blood poisoning. It may not be a bad thing unless you have inhaled or taken things in food that could poison the blood.

Your period is not just bleeding. It is also the sloughing off of endometrial tissue that is built up in the uterus to nourish a fetus and that are expelled when not needed for a pregnancy. If you have concerns about your reproductive organs please see a Gynecologist for a thorough examination.