40-year-old wants a second child, menstrual period for two days with little flow, and not yet regular.

Patient's question:

Sure, here is the translation of the content you provided:
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Doctor's answer:

Hello, Calendar Table Method: For women with irregular menstrual cycles, you can calculate based on the past 6-12 months of menstrual cycles: The shortest cycle (days) - 21 days, the period before is the safe period in advance. The longest cycle (days) - 10 days, the period after is the safe period behind.