If a pregnant woman’s progesterone value is lower than 5ng/ml, she may have a case of fetal arrest, and it is usually not recommended to continue the birth control. However, a definitive diagnosis is also needed depending on the specific condition of the pregnant woman, such as through blood tests for HCG. Progesterone is a progesterone hormone secreted by the ovaries, which is biologically active. During a woman’s pregnancy, progesterone values tend to increase. Usually, the value of progesterone in early pregnancy is about 11.5-43ng/ml, in mid-pregnancy it is about 19.5-82.5ng/ml, and in late pregnancy it is about 65-228.9ng/ml. If the value of progesterone is lower than 5ng/ml, you need to further check the value of blood HCG, if the value is not doubled, or even a significant decline, then the pregnant woman may have stopped the development of the fetus, and then continue to protect the fetus can not play a role, you need to terminate the pregnancy in a timely manner.