Hey, I Have A Question. This Month I Got My

Hey, I have a question. This month I got my period just right on time but first three days were lighter than my normal periods and the flow got heavier on the fourth day. My periods last 7 days but today is the 8th day and I'm still on my period, though the flow is extremely light. Is it normal? This month was really stressful for me, can stress be the cause? Or should I be worried?