When calculating the pregnancy period, 10 weeks of pregnancy is 2 months more than 2 weeks, i.e. 4 weeks is 1 month. At 10 weeks of pregnancy, the uterus is obviously enlarged, the fetal organs are gradually developed and have taken human form, the heart is formed, the cardiovascular beat is obvious, and during Doppler ultrasound examination, the fetal heart sounds can be heard clearly on the pubic symphysis. At 10 weeks of gestation, the level of chorionic gonadotropin in the blood gradually stabilizes, the vomiting reaction gradually decreases, and the pregnant woman has gradually adapted to the pregnancy state. However, at this stage, the fetus is still sensitive to the effects of drugs, and if the drugs are not used properly, they may still affect the development of the fetus. At this stage, it is recommended that the pregnant woman’s diet is still light. After 1 week, blood can be drawn for early screening for Down’s syndrome and trisomy 18 in combination with the 4D results.