My period hasn’t stopped..?

My period started last week and it typically lasts 5 days, plus spotting the day after. I am currently on day 8 and have a relatively heavy flow for someone who’s three days over their usual end date. I’m not spotting but my flow isn’t super heavy either.

Idk what to do because I’ve never had this happen to me before, nor do I know why it’s happening. I tried googling it and google is trying to tell me that it’s a sign of menopause or some disease.

I’m in my teens, so obviously it’s not a sign of menopause. I’m also not sexually active or on any medication that could be altering it like this.

I don’t think it’s stress either, I’ve been pretty relaxed lately.

Any explainations?