Period or odd cycle?

Soooo, my period is like clockwork. But this month it (or some other type of bleeding) came a couple days early. On top of the date change, it was quite heavenly. Cramps were at a minimum, not as heavy as normal, no noticeable clots, and much easier to tend to.

I stopped using tampons the night of day 4 because the blood was just SO MINIMAL that it was a waste at that point. But now, this is day 2 post bleeding— I’m exhausted, tired beyond all belief, not much of an appetite, and have the worst cramps and diarrhea ever. Sorry if that’s TMI.

Any idea what’s up?!?!