What causes progesterone levels to sometimes be high and sometimes be low?

Patient's question:

No

Doctor's answer:

Progesterone is a progestogen that plays a role in maintaining pregnancy. Low progesterone levels can easily lead to miscarriage. Your ultrasound results indicate that the embryo is viable, and the low progesterone level may be caused by luteal phase deficiency of the ovary. It is recommended to rest in bed and receive progesterone injections to continue with the treatment for maintaining the pregnancy.