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Conception Reverse Calculation:
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Conception reverse calculation is a method to estimate the date of conception based on the estimated due date (EDD). This calculation helps determine when fertilization likely occurred during the pregnancy timeline.
The calculator uses the standard pregnancy calculation formula:
Where:
Explanation: This calculation assumes a standard 266-day gestation period from conception to estimated due date, which corresponds to approximately 38 weeks of pregnancy.
Details: Knowing the conception date is important for accurate pregnancy dating, understanding fetal development milestones, and for medical and personal planning purposes throughout the pregnancy journey.
Tips: Enter your estimated due date (EDD) as provided by your healthcare provider. The calculator will automatically compute your estimated conception date by subtracting 266 days from your EDD.
Q1: Why 266 days specifically?
A: 266 days represents the average gestation period from conception to delivery, which equals approximately 38 weeks of pregnancy.
Q2: How accurate is this calculation?
A: This provides an estimate. Actual conception dates can vary due to individual differences in gestation periods and ovulation timing.
Q3: What if my EDD was calculated from my last menstrual period?
A: If EDD is based on LMP, conception typically occurs about 14 days after the first day of your last period, so the calculation may differ slightly.
Q4: Can this determine the exact day I conceived?
A: This provides an estimated date range. Conception can occur within a window of several days around the calculated date due to sperm survival and ovulation timing.
Q5: Should I use this for medical decisions?
A: Always consult with your healthcare provider for accurate pregnancy dating and medical guidance. This calculator is for informational purposes only.