There’s a clear point of impact along the 6 o’clock line, midway between the center and edge. This is not a random “just happened”; rather, it’s a case of the watch being dropped or hit while not on your wrist.
Further, there’s missing pieces of glass. Which means sharp edges pressed against your wrist — very bad, very dangerous. Do not wear this watch again.
And, oh-by-the-way, the watch isn’t even remotely, vaguely water-resistant. It’s only a matter of time (and not much at that) before moisture corrodes something inside, possibly even doing something nasty to the battery. Possibly, even, a fire hazard.
Please put this watch in a sealed Ziploc bag and hand-deliver it post-haste to — in order of preference — an Apple Store; an Apple Authorized Service Provider (including Best Buy and many others); or somewhere equipped to accept e-waste (every municipality has one).
If you have ongoing (paid monthly) AppleCare+, the Apple Store or the AASP can discuss the charge to “repair.” (You’ll actually exchange it for a refurbished watch of the same model.) If you don’t, the only option is to pay out of pocket for a replacement (or do without).
Again:
Do not wear this watch.
Do not charge it.
Hand-deliver it ASAP to somewhere equipped to accept e-waste.
Do not ship it.
Do not mail it.
Do not throw it in the trash.
Cheers,
b&