Why can't pregnancy be detected on an ultrasound exam?

Patient's question:

Medical history: Female, 27, last menstrual period was on June 17. Past treatment and effectiveness: Ultrasound showed no pregnancy, blood test result was 40.84. Desired help: Please confirm if I am pregnant, and why the ultrasound failed to detect it?

Doctor's answer:

In your case, pregnancy has been ruled out. It is likely due to menstrual disorders. Menstrual disorders, also known as irregular menstruation, are a common gynecological condition characterized by abnormalities in the menstrual cycle or bleeding volume, which may be accompanied by abdominal pain and systemic symptoms before or during menstruation. The causes may include organic lesions or functional disturbances in the body, such as excessive stress or tension. These factors can all lead to menstrual disorders. It is recommended to consult a doctor in a formal hospital for further testing. You may be concerned about an excessively long menstrual cycle, but in fact, a normal cycle is typically 28 to 30 days. A regular menstrual cycle generally has an interval of at least 20 days or no more than 45 days between two periods. The duration of a normal menstrual period is usually 2 to 7 days, with most lasting 3 to 5 days.

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