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Continue to ChatWhat%20is%20the%20point%20of%20talking%20about%20week%201%20of%20pregnancy%20if%20fertilization%20has%20not%20yet%20occurred?%20Why%20is%20it%20counted%20from%20the%20last%20menstrual%20period? – https://www.invitra.com/en/faqs/what-is-the-point-of-talking-about-week-1-of-pregnancy-if-fertilization-has-not-yet-occurred-why-is-it-counted-from-the-last-menstrual-period/