Progesterone tablets are used to protect the pregnancy, especially in early pregnancy when insufficient progesterone production can lead to miscarriage, during which the progesterone level can be determined by a blood test. If the progesterone level is low, the progesterone can be replenished by taking dydrogesterone or progesterone, which can play a role in preserving the pregnancy. The main reason for miscarriage in early pregnancy is the lack of progesterone in the body. In the middle and late pregnancy, the purpose of taking progesterone orally is to relieve the contractions of the uterus, which can also lead to miscarriage or preterm labor due to the sensitivity to contractin.