hi @KLock, I think your situation may not be typical, in that you are very likely honeymooning (your body is still making insulin) and you are working out.
at what blood sugar are you starting your workout? ending? activity can change your insulin sensitivity (and by change I mean make you VERY sensitive to insulin) for up to 8 hours afterwards. If your body made NO insulin, you may find you have to take 1/2 your normal insulin. In your case, you may find you need to take less, or even zero insulin for that meal.
the way you tell is by making a change and then doing more blood testing and Libre scanning afterwards. Be aware that a CGM/Libre are less accurate when your blood sugar is changing over time than they are when your blood sugar has been not changing quickly. Verify your Libre by taking an actual finger prick BS test.
you should NOT make changes to your insulin unless you are comfortable making them. You should always discuss changes with a doctor or CDE, but eventually, you will need to make all your own decisions about when and how much insulin to take. Over time and experience, these decisions become routine. A great reference is the book “Think Like a Pancreas”.
a great piece of advice from one of my doctors: you can always take more insulin. meaning, if you find you are higher than you want after a meal, that’s when you can do a “correction bolus” to help bring your blood sugar back down.
this will likely ALL change, as your body stops making insulin. good luck. hope you are ok.