The first pregnancy test at 6~13+6 weeks is appropriate, need to be under the guidance of the doctor on time obstetric examination. Reasonable and standardized obstetric examination during pregnancy can ensure the safety of mothers and babies. Generally, the first obstetric examination is recommended to be carried out at 6~13+6 weeks of pregnancy, and ultrasound can be used to confirm intrauterine pregnancy and check the gestational week according to the size of the fetal buds, as well as project the expected date of delivery. Laboratory tests such as blood and urine tests, liver and kidney tests, Hepatitis B, HIV, syphilis, etc. are also performed. In early pregnancy, NT (nuchal translucency) is also measured by ultrasound at 11-13+6 weeks of gestation to initially screen for the risk of chromosomal disorders in the fetus, and relevant screening tests, such as Down’s syndrome screening or non-invasive prenatal testing (NIPT) in the middle trimester, amniocentesis, and screening for structural malformations in the fetus are also performed as prescribed by the doctor.