Penfold, I can never quite grasp the concept of delaying to be rid of the effects of x,y, or z. Surely it's more informative and educational to know exactly the impact of a period of overeating, stress, over drinking, not exercising or whatever (not suggesting you did any or all of those things). The A1c is just what it is.
If you were to find your A1c rose a lot, then it sends you a message you can properly interpret about how you handle future events (within your control - clearly illness or injury aren't). If it doesn't go up much, then you know you have some leeway in how you live.
I asked for an A1c pre-surgery, after several stressful months of tests, leading to a diagnosis. Because I'm not on the diabetic register, I wasn't due to have one, but as I was having a general panel done, I asked if it was included and the nurse offered the option. It had risen from 31 to 33. A couple of months post-surgery, and a tricky little complication, it was still 33, but once all that cleared, I've gone back to 31.
From that I learned that stress isn't my best friend, but nor was it catastrophic. It is what it is. Not knowing doesn't stop it being.
I'm not criticising what you're doing, just offering up a contrary viewpoint, with an upside.