I'm hoping you received a new watch.
I noticed that I couldn't "dismiss" messages on Saturday, but didn't really think anything of it because I was able to do everything else. I thought I just needed a power off/on. Then on Sunday I noticed a crack that went from the top left corner to the bottom right. There are no impact signs (no "star" or other cracks and the crack is uniform from top to bottom). The touch screen no longer works on the bottom of the crack, but works above. I reached out to Apple. They said that if there is no sign of damage and it's under warranty, it could've been from an expanding battery and they'll swap it. They said I had to take it to the store or an authorized retailer. I brought to an authorized retailer near my office and they have to send it to the repair depot. They said they've seen Apple replace the watch if there is no obvious sign of damage.
I'm sure I've banged the watch a bit, but that's what happens with watches. I don't recall any substantial hits. I've done MUCH worse with my phone and traditional watches. Even if I get a new watch from Apple, I'm a bit unimpressed.