Why is there no gestational sac visible in the uterine cavity at 40 days of pregnancy?

Patient's question:

I have an itchy lower body, and my underwear is always yellow. What's going on? Why can't I see a gestational sac in the uterine cavity at 40 weeks of pregnancy?

Doctor's answer:

The cervical erosion you described, as well as cervical inflammation, is generally caused by childbirth trauma, improper sexual activity, or retrograde infection from vaginal inflammation. Currently, treatment can be administered through microwave therapy or herbal medicine that clears heat and promotes diuresis.
It is recommended that you specify the time of blood tests, such as when you took the test during your menstrual cycle. No treatment is necessary, as it does not affect your fertility. However, progesterone deficiency can impact pregnancy. The ovaries can secrete hormones.

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