After pregnancy, in order to ensure the health of the mother and fetus, pregnant women need to go to the hospital for regular physical examinations. Pregnancy examination can detect abnormalities in the mother or fetus in time and provide timely treatment. Obstetric examination items: First obstetric examination (blood pressure, weight, uterine height, abdominal circumference, Doppler, gynecological examination) Nutritional monitoring during pregnancy, B-ultrasound, electrocardiogram, MDI secretion 2. Secondary examination Pregnancy period: 16-20 weeks of pregnancy