The recommended fasting (before your meal) blood sugar for pregnant diabetic patients should be between 60-90 mg/dL. Post prandial (1-2 hours after your meal) blood sugars should be less than 120 mg/dL. If your blood sugar log shows that you have consistently high glucose levels, your doctor may put you on a diet and recommend exercise. If that does not control your blood sugar, your doctor may prescribe injectable insulin.