For pregnant women with undiagnosed diabetes and those who have been diagnosed with diabetes, a fasting blood glucose of 3.7mmol/L is usually normal. 1. Pregnant women with undiagnosed diabetes: Due to the changes in hormone secretion during pregnancy, the normal value of fasting blood glucose for pregnant women is lower than that of normal people, and the normal value of fasting blood glucose for pregnant women is 3.1-5.1mmol/L. Therefore, a pregnant woman’s fasting blood glucose of 3.7mmol/L can be regarded as normal. 2. Pregnant women who have been diagnosed with diabetes mellitus: all types of gestational hyperglycemia pregnancy blood glucose target: fasting blood glucose <5.3mmol / L, so pregnant women fasting blood glucose 3.7mmol / L is within the normal range. Pregnant women with abnormal fasting blood sugar can consult a professional doctor in detail for diagnosis and treatment to avoid delay.