Low progesterone at 6 weeks of pregnancy can affect the growth and development of the fetus, and even embryonic arrest or miscarriage. The role of progesterone for the fetus is to maintain the stability of the fetus in the uterus and prevent uterine contractions from adversely affecting the fetus. At 6 weeks of pregnancy, the role of progesterone is very critical and directly determines whether the fetus can grow and develop normally. At this time, the fetus is still unstable, and low progesterone is likely to cause fetal growth and developmental delays, and even lead to embryonic sterilizations as well as miscarriages and other phenomena. If a pregnant woman finds that her progesterone level is low, she needs to consult a doctor in time and take progesterone and other drugs under the guidance of the doctor to supplement the endogenous progesterone, without delay, in order to prevent the impact on the health of the fetus. At the same time, pregnant women should avoid strenuous exercise to promote the stability of the fetus in the womb.