Is it normal for menstruation to be delayed after sexual intercourse?

Patient's question:

Please ask the doctor: My menstrual cycle is usually very normal, but after my first sexual intercourse with my boyfriend, my period came ten days later. However, this month my period arrived. Is this normal? Could I be pregnant?

Doctor's answer:

Hello, the menstrual cycle of women is generally 28 to 30 days. Being 7 days earlier or later is still within the normal range, and the length of the cycle varies from person to person.
Environment, mood, certain medications, or illnesses can all disrupt menstruation. If your period is one week early or late, it is still considered normal. If it doesn't arrive for more than 10 days or longer, it is recommended to use early pregnancy test strips or check blood HCG for confirmation. If pregnancy is ruled out, it may be considered menstrual irregularity, and an endocrine examination is needed to identify the underlying cause.

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