When you are about 35-40 days pregnant, you can check whether you are pregnant and whether the location, size and shape of the gestational sac are normal by ultrasound and blood HCG test, etc. After that, you can register for the obstetrician’s consultation. The obstetrician will ask the pregnant woman about her last menstrual history and sexual history, make a preliminary analysis and diagnosis, and issue a corresponding examination request form for further clarification of the diagnosis. Routine examinations during the entire pregnancy are performed in the obstetrics department. If it is not convenient to visit the obstetrics department of a general hospital, you can also visit the maternal and child health department of a primary care unit, where routine examinations during pregnancy can be performed. If a pregnant woman has special risk factors during pregnancy and is a high-risk pregnancy, she must be seen in the obstetrics department of a general hospital for prenatal checkups.