Can sexual intercourse before menstruation be impossible to conceive?

Patient's question:

Is it true that if a woman has had a normal menstrual cycle, any previous sexual intercourse will never result in childbirth? If she becomes pregnant, it would be the child of the person she had sex with after her last menstrual period, right? Is this scientifically sound? Does it mean that the genes of the person she had sex with before her menstrual period have no relevance? Thank you, doctor.

Doctor's answer:

According to your description, in most cases, if a woman has her period, it means she is not pregnant. However, in a very small number of cases, women who become pregnant may still experience vaginal bleeding on the scheduled date for their next period. In such situations, the pregnant woman often mistakes it for her period and remains unaware that she is pregnant. This recurring bleeding after pregnancy is known as "early pregnancy bleeding." Its characteristics include light spotting, pale color, and a shorter duration, making it different from any previous menstrual period. In reality, this is not true menstruation. This phenomenon typically occurs within the first three months of pregnancy and usually appears only once, though some pregnant women may experience it 2–3 times. During menstruation, pay attention to personal hygiene, avoid extremely cold or spicy foods, and refrain from consuming high-nutrient foods like crabs. Take care to prevent colds, avoid overworking, and do not engage in overly strenuous training.

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