Can it be normal for periods to start of brownish and stay brownish. what does it mean to start a period early and is it bad?

Irregular menses: Especially at your age, irregular periods are not unusual. Be sure you are not pregnant since this can cause a change in periods, as can use of oral contraceptives. There are many reasons for variations, the majority of which are not serious in any way. Dark blood is typically older blood that spends time in the uterus before it comes down.