Fasting blood sugar 5.2mmol

What is the normal blood sugar range for pregnant moms? I took my blood glucose this morning right after waking up it was 5.2mmol, and 5.7mmol after i came out from shower and preparing to go out. It was a 30-40min time gap. Idk what to do. What should i do to keep it at 5.0mmol? I heard more than this considering as gdm..