Earlier than expected

I was going through my nightly rituals, and when I got to the part where I go potty I found that my period has started. I just took the last progesterone dose for the month this morning (they always stop on the 20th).

When I first started on these hormone treatments, in October, the period started on the 23rd. The second month, it started on the 21st. And now it’s starting before even a day has passed.

I wonder if this is a good thing, a bad thing, or if it means anything at all.