My period is black ??

I started my period a day early. I’m ALWAYS pretty regular. When I got my period yesterday it was black and full of clots. There is no way I’m pregnant. Is that normal ? It’s never happened to me.

The first picture is the 4th time I changed my tampon yesterday. It was starting to get a bright red. The second picture is today.

I’ve never had a clot when I had my period.