Usually pregnant women who have had routine blood tests still need to have routine blood tests at 12 weeks of pregnancy. The results of routine blood tests at different weeks of pregnancy can only represent the situation at that time, and cannot be generalized to represent the whole pregnancy or a certain stage. Routine blood tests are able to detect problems in the body systems of pregnant women in the course of pregnancy. Problems such as anemia, infections, coagulation disorders, etc. may affect the development of the pregnant woman and the fetus, leading to serious consequences such as miscarriage, preterm delivery, and fetal developmental abnormalities. Therefore, 12 weeks pregnant women still need to do routine blood tests. Every checkup during pregnancy is to increase the safety of the fetus and the life of the pregnant woman. It is recommended that pregnant women take the checkups on time, increase the dietary intake of nutrients in their daily life, prohibit smoking and drinking, and stay away from second-hand smoke. If there is any discomfort, it is recommended to consult a doctor in time.