What are the reasons for miscarriage caused by low progesterone?

Patient's question:

Medical Description: Last menstrual period: 5/19, 44 days of amenorrhea, slight vaginal bleeding for 1 day. Pregnancy test was positive. Visited Jiangxi Maternal and Child Health Hospital on 7/2, and had a follow-up visit on 7/9.
Treatment history and effectiveness:
7/2 Examination Results
Ultrasound findings: Retroverted uterus, intrauterine fluid shadow size 5MM4MM3MM, no yolk sac observed, no significant abnormal masses in bilateral adnexa.
Blood test results: Progesterone 3.8

Doctor's answer:

Hello, low progesterone levels can easily lead to fetal miscarriage. If you experience vaginal bleeding, abdominal pain, or a heavy feeling, it is recommended to visit a hospital for intramuscular injection of progesterone and follow-up after one week. You can undergo an ultrasound examination or an HCG test.
It is advised that you seek professional guidance from a qualified doctor in a reputable hospital to determine whether oral or intramuscular progesterone should be administered for fetal preservation treatment based on hormone levels. Timely additional hormone supplementation, along with adequate rest, improved nutrition, and avoiding strenuous exercise, can all promote fetal stability.

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