Period blood

Ok so I’m 14 and I’ve had my period for about 1 and 1/2 to 2 years now and I don’t have a mom to ask.

I have been on my period for 3 days. I usually have a heavy flow through out my whole period. But the past three days it has been unusually slow and the little blood I do have is a very dark red. Darker than I’ve ever seen. Is this normal?