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Naegele's Rule: The gold-standard method used by OBs worldwide. Due date = first day of LMP + 280 days. For cycles other than 28 days, we auto-adjust.
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Estimated Due Date
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🌱 Journey Progress
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ConceptionWeek 20Due Date
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ⓘ This calculator provides an estimate only. Only ~4% of babies are born on their exact due date. Always consult your healthcare provider for accurate dating and prenatal care.