The value of progesterone in a woman 7 days after ovulation is between 9.5 and 64 nm0l/l. The value of progesterone during this period does not prove whether a woman is pregnant or not. Under normal circumstances, a woman is highly suspected of early pregnancy if the egg and sperm can unite and develop into a fertilized egg after intercourse, and the progesterone value is not checked when the level of human chorionic gonadotropin is elevated in a blood test 7-8 days after intercourse. When a woman reviews her human chorionic gonadotropin level at about 40 days of menopause, the level of progesterone is checked. An increase in the value of progesterone level during this period is only indicative of a good embryonic growth and development in the uterine cavity. If the progesterone level is low, the embryo is not firmly established in the uterus and there is a higher chance of preterm miscarriage, so progesterone medication should be given to preserve the pregnancy.