If you have access to a meter, check your morning(12 hour) fast level, then 1 hour after eating, 2 hours after eating and 3 hours after eating.
The numbers should be
Fasting 85 or less
1hr post meal is less than 140
2 hours post meal is less than 125
3 hours post meal is back to fasting level
If you have dawn phenomenon(sp?) your morning fasting number may be higher than the "normal" 85< - BUT, your 3 hour post meal number should be 85 or less, not the elevated morning number.
If any of your numbers are higher than the ranges - then you have an insulin problem and your body is not handling the sugars it's igesting properly.
Blood test meters are pretty cheap and can be purchased online or at places like walmart and such.
A single high test from the doctor may be a fluke, but if it's a regular thing and not dawn phenomenon, it may be a problem.