Pregnant women need to undergo pregnancy tests regularly throughout their pregnancy to keep abreast of the condition of the pregnant woman and the fetus by observing changes in her breasts and uterus, as well as by means of ultrasound and electrocardiogram. Due to the characteristics of different stages of embryonic development, the focus of the examination varies, but basically, some routine examinations should be performed. The first choice should be clear that if you are not planning to get pregnant and have been concerned about your pregnancy, most women discover pregnancy unexpectedly due to delayed menstruation, early pregnancy reaction or medical checkups, so pregnancy checkups mostly start from 5-6 weeks after pregnancy. The checkups in the first few weeks include determining whether or not pregnancy is present, blood and urine routine, height, weight, syphilis, toxoplasmosis screening, blood type, ultrasound, etc., which help to get a comprehensive picture of the pregnant woman’s health. The embryo sac can be examined by ultrasound at 5-6 weeks of pregnancy to determine if there is an ectopic pregnancy, and the fetal heartbeat can be measured by ultrasound at 7-8 weeks of pregnancy. Thereafter, the 1st official check-up will not start until the 12th week of pregnancy.1. 1st check-up: It is performed at the 12th week of pregnancy and has more items. The main items include determining the week of pregnancy, predicting the due date, screening for hepatitis B, syphilis, HIV and other viruses, measuring the fetal heart rate, blood pressure, blood sugar, blood type and weight. If you have not been examined before, you should also be screened for thalassemia and parasites in pet-owning families, as well as get a comprehensive understanding of the health status of both parents and immediate family members; 2. 2nd maternity checkup: usually performed at 16 weeks of pregnancy. In addition to the regular checkups, the abdominal circumference, fundal height and fetal heart rate should be measured, and the fetal body should be observed by ultrasound for abnormalities. The 5th checkup: the checkups at 28 weeks of pregnancy are basically the same as the 4th checkup, and ultrasound is also needed to observe the condition of the fetus and to determine whether there is anemia, and if there is anemia, it should be treated in time. From this week onwards, the checkup will be changed from once every 4 weeks to once every 2 weeks, and the 6th checkup in the 30th week of pregnancy will be the same as the current one. Ultrasound examination is needed at 36 weeks of pregnancy to observe the size of the fetal biparietal diameter and amniotic fluid volume, to assess the current weight of the fetus, the weight of full-term delivery, developmental status, etc. In addition, routine items and streptococcal culture tests are also needed; 9. 10.10th and 11th checkups: 38 weeks and 39 weeks of pregnancy are near the due date, the main items are routine checkups and fetal heart monitoring, pregnant women also need to observe fetal movement by themselves; 11.12th checkup: the last checkup is at 40 weeks of pregnancy, besides routine checkups, the main item is to closely monitor the fetal heart to ensure the safety of the fetus and pregnant women’s life.