The normal value of fasting blood sugar during pregnancy is 3.1-5.6 mmol/L. The blood sugar of pregnant women generally does not exceed 10 mmol/L one hour after meal and 8.5 mmol/L two hours after meal. In early pregnancy, due to the tendency of nausea, vomiting and loss of appetite, most pregnant women do not eat much, so hypoglycemia may occur at this time, as long as the performance is dizziness, headache , panic, hand trembling, hunger, pale face, general weakness and even serious to blurred mind. If you can’t eat by yourself and throw up, go to the hospital to seek medical attention, mainly intravenous nutrition drip. In the middle and late stages of pregnancy, it is still necessary to measure blood sugar in order to prevent the increase of blood sugar. If a pregnant woman has gestational diabetes, if her blood sugar is only slightly over the limit in the first measurement, she should control her diet, the first one is to control the main food such as rice and steamed buns; the second one is sweet food, such as cakes and desserts; the third one is sweet fruits, such as apples and bananas, etc., and then test her blood sugar after controlling her diet. If the blood sugar returns to normal level, the diet should be controlled in the second trimester. If the blood sugar does not reach the normal value through diet control, insulin treatment may be necessary. This is because if gestational diabetes is not controlled in time, it will not only cause obesity in pregnant women, but the fetus may grow into a huge baby, causing the possibility of difficult delivery, premature delivery and premature rupture of membranes. Therefore, it is important to monitor blood sugar regularly during pregnancy.