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🤰 Conception Calculator
Estimate your likely conception date from your due date or last menstrual period (LMP).
How Is Conception Date Calculated?
Conception typically occurs about 14 days after the first day of your last menstrual period (LMP), or approximately 266 days (38 weeks) before your due date. This calculator uses both methods to estimate the most likely conception window.
Understanding the Conception Window
Sperm can survive up to 5 days in the reproductive tract, and an egg is viable for about 24 hours after ovulation. The conception date shown is an estimate — the actual fertilization could have occurred within a few days of the calculated date.
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