At 6-8 weeks of menopause, ultrasound examination is performed to determine whether the pregnancy is intrauterine, the number of fetuses and fetal heartbeat, and to exclude the possibility of ectopic pregnancy. At 11-13 weeks of menopause, ultrasound examination of the nuchal translucency (NT) is performed for early screening of fetal chromosomal abnormalities. At 16-18 weeks of menopause, Down’s syndrome screening will be performed to screen for chromosomal abnormalities such as trisomy 21, trisomy 18 and trisomy 13. Amniocentesis (performed at 16-24 weeks) or fetal prenatal non-invasive DNA screening is required if the pregnant woman is of advanced age (maternal age over 35 years) or has a history of adverse pregnancy or childbirth. At 20-22 weeks of menopause, ultrasound screening for fetal malformations. At 24 weeks of gestation, the doctor will take a blood sample from the mother-to-be for glucose and bile acid screening tests and routine blood tests to screen for infectious diseases (e.g. hepatitis B, C, syphilis, HIV). If gestational diabetes is detected, the treatment should be controlled by diet and insulin injections, never by oral hypoglycemic drugs, which may affect the fetus. If bile acid is elevated, it is cholestasis of pregnancy, which requires monitoring and medication until after delivery, and in some cases, even early termination of pregnancy. After the middle of pregnancy, you are more likely to have anemia and calcium deficiency, so you should consume more iron-containing foods to supplement iron and calcium. Fetal heart ultrasound screening for congenital heart disease at 24-26 weeks of gestation. (Be sure to get checked!) 28-40 weeks of pregnancy, regular maternity checkups at the obstetrics clinic.