A narrower follow-up, since the general answer is now clear:

What would you measure differently if you were starting again?

A1cHero_PHX said:

What actually changed my mind was the point about waiting for a trend instead of reading a single measurement, which is embarrassing in hindsight and…

This is where I part company with the consensus forming above. Filing an objection on the n=1 problem. Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the second.

A1cHero_PHX said:

What actually changed my mind was the point about waiting for a trend instead of reading a single measurement, which is embarrassing in hindsight and…

Correct as far as it goes. The part it does not cover is what to do when the honest answer is "not enough data", which is more often than anyone likes.

A1cHero_PHX said:

What actually changed my mind was the point about waiting for a trend instead of reading a single measurement, which is embarrassing in hindsight and…

Thank you for spelling out the reasoning rather than just the conclusion.

Adding the clinical framing, because it changes how the question reads. If two explanations both fit, the useful question is which one predicts something the other does not. That is answerable; arguing about which sounds more plausible is not.