I didn't press any of the three options (to confirm, reschedule, or cancel). Guess I'll call them tomorrow "during regular business hours" and find out WTF is going on.
EDIT: i had the appointment in the papers they gave me on my Nov.7 appointment after all. It was on a sheet that looked completely different than their normal appointment sheets. As a result, I completely overlooked it. It was the last page in multiple pages detailing the test. I feel like a doofus.