What are the reasons for delayed menstruation for a long time?

Patient's question:

Menstruation has arrived. But it's been delayed by 5 days this month and hasn't come yet. What could be the reason? It can't be pregnancy, right? I'm so nervous. If it were pregnancy, why did it come that month? I'm so conflicted.
Medical history and treatment effectiveness:
Age: 22. Had sex with a boyfriend. Later, he left. I haven't had sex or been touched by any male since then. My period came that month when he left. But it's delayed by 5 days this month and hasn't arrived yet. What could be the reason? It can't be pregnancy, right? I'm so nervous. If it were pregnancy, why did it come that month? I'm so conflicted.
Help needed:
Age: 22. Had sex with a boyfriend. Later, he left. I haven't had sex or been touched by any male since then. The month he left...

Doctor's answer:

Hello, first go to the hospital to check if you are pregnant. If it is not pregnancy, it may be delayed menstruation. Factors such as environmental changes, emotional fluctuations, and stress from study or work can all cause delayed menstruation. Some organic lesions can also cause delayed menstruation. It is recommended to relax, observe closely, and if your period has not arrived after a week, it is recommended to have a six-sex hormone test in a regular hospital to determine it. If necessary, you can take progesterone under the guidance of a doctor to induce menstruation. Environment, mood, certain medications, or diseases can all cause menstrual disorders. One week early or delayed menstruation is a normal phenomenon. If your period has not arrived for more than 10 days or longer, it is recommended that you can use a pregnancy test paper or check blood HCG for confirmation. If pregnancy is ruled out, it is considered menstrual disorder, and an endocrine examination is needed to identify the cause.

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