They go ahead and schedule you for the second dose. So my second shot will be four weeks from yesterday.
By the way -- as a public service announcement to all concerned -- the Moderna vaccine comes in packages of 10. Last night, someone who met the vaccine criteria (age- and/or health-wise) showed up just before the Publix pharmacy was going to close. Turns out that I would not have been able to get the vaccine if he hadn't come at the end of the day. That's because the pharmacist had to open a whole new 10-pack to give him his dose. That meant there were 9 more doses that would have been useless by the following morning. So, at that point, the pharmacist will give them to anyone present, rather than letting them go to waste. That's how I got mine.
If you try to get a vaccine like I did, I would suggest that you look for a place that uses the Moderna vaccine -- since it comes in the 10-packs. The Pfizer vaccine comes in packages of 6. So you have a relatively lower likelihood of getting "leftovers" with Pfizer b/c the packages are smaller. Simple math.
My wife is a social worker, and she provided me with all of this info. She also suggested that the Moderna vaccines are more prevalent in pharmacies inside grocery stores because they have the large-scale refrigeration necessary to store that particular vaccine.
I'm no expert on any of this, BTW. Just passing along info.