How did ancient doctors describe pregnancy?

In ancient times, doctors were too pregnant to describe pregnancy. According to relevant data, it is mentioned in the Three Classics of Sui Shu that a woman's pregnancy is six days for Jia Yin, Jia Yin, Chen Jia, Wu Jia, Shen Jia and Xu Jia, which is the day when God created everything. This day symbolizes the beginning of life and is also the day when women are most likely to get pregnant, so it is called pregnancy.