Brush Tool turned square?

[Egyptian318551799gge]

So I've recently been using Photoshop, the latest update, and a little bit of the beta Photoshop 2024, and when I was using it, the brush suddenly turned square. I'm working on a project of something that all has small pixel sizes, so I'm trying to use 1 pixel sized brushes. But it went from being circle to now being square. I don't know what I hit or how to fix it. I can't seem to find any posts that share this issue. It's the cursor itself, instead of circle being square. I only found posts about the cursor turning into crosshairs nothing about this.

[Jeff Arola]

Maybe the Brush Tool got inadvertently switched to the Pencil Tool