period help!!

Hi I'm a 14 year old girl and has had my period for almost 2 years now. People may think I should know everything about periods but I don't. This is my 4th day in my cycle and my blood is brown ish red. It has been like this since the first day and hasn't stopped. I thought maybe it was blood left over from the previous period but why would it still be brown on my 4th day? Please help me thank you all❤️