What could be the reason for a one-week delay in menstruation?

Patient's question:

No

Doctor's answer:

First, pregnancy; second, menstrual irregularity. Currently, a one-week delay in your period with a pregnancy test cannot accurately determine if you are pregnant. It is recommended that you test again in one week. If the test still shows no pregnancy at that time, it is likely menstrual irregularity. It is advised that you visit a hospital for a routine gynecological examination to identify the cause of your menstrual irregularity and receive targeted treatment.