How can there be no gestational sac visible on ultrasound at 4 weeks of pregnancy?

Patient's question:

Sure, here is the translation of the content you provided:
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No
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Doctor's answer:

It can only be seen after a check-up five weeks later. After a one-week delay in the menstrual cycle, a pregnancy test can be used to detect it. Two red lines appearing on the test paper indicate a positive result, meaning pregnancy; alternatively, you can go to the hospital to have your blood tested for human chorionic gonadotropin to confirm whether you are pregnant.

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