Miscarriage or period??

So last Tuesday January 9 this happened.

It’s now January 17 and I’m still bleeding.

Here and there I’ll get really bad cramps. That hurt a lot and more blood will come out. Just like a period.

It’s been about 8 days now. Still bleeding.

A few people said it’s a miscarriage but I took a pregnancy test and it was negative. I just don’t know.

Any thoughts?