When you say net carbs.... Please don't tell me you've been subtracting fibre? Because that's only in the US, where they haven't done that yet in the nutritional info... The rest of the world basically does, so the carbs listed are the carbs counted.
And even if all's well with the carb counting, you're only just getting started, so... Give yourself some time. Stress, the heat, lack of sleep/nightmares/anything, and yes, even fasting, kan kick up your blood sugars a notch if your liver decides to "help out" by dumping glucose.