Progesterone should not be routinely taken during pregnancy because progesterone for fetal preservation should only be applied if the diagnosis is progesterone deficiency in the body, which affects fetal development. Some of the embryonic dysplasia is caused by chromosomal abnormalities, in this case even oral progesterone cannot achieve the effect of fetus preservation. If the embryo is developing well and there is no fetal heart or fetal bud for the time being, there is no need to take progesterone. If the pregnant woman has low progesterone, even if there is a fetal heart and fetal bud, she needs to continue to take oral progesterone until the third to fifth month of pregnancy. Therefore, pregnant women need to apply medication under the guidance of a doctor for fetal preservation, and should not take medication for fetal preservation at home privately.