Why is progesterone low after pregnancy?

My sister is two months pregnant. Today she went to the hospital for a check-up and found that her progesterone was very low. I am very worried. May I ask the doctor why the progesterone is low after pregnancy?

The reasons for low progesterone after pregnancy include: 1. The ovaries have functional abnormalities, resulting in hypoplasia of the corpus luteum. The progesterone secreted by the corpus luteum is insufficient, and low progesterone will appear. 2. The adrenal or thyroid glands of pregnant women are dysfunctional, resulting in persistently low progesterone levels. When pregnant women have low progesterone, they should seek help from a doctor in time, and actively carry out miscarriage treatment after clarifying the cause. Normal pregnant women should stabilize their emotions, pay attention to rest, and strengthen nutritional supplements to maintain protein, vitamins, trace elements and other substances. Go to the hospital for an obstetric examination to monitor various indicators of yourself and the fetus.