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Conception Date Formula:
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The Date I Got Pregnant Calculator estimates the conception date based on your estimated due date (EDD). It uses the standard calculation of subtracting 266 days from the due date to determine when conception likely occurred.
The calculator uses the conception date formula:
Where:
Explanation: This calculation is based on the average pregnancy duration of 280 days (40 weeks) from the first day of the last menstrual period, minus 14 days to account for the typical time between menstruation and ovulation.
Details: Knowing your conception date helps in understanding your pregnancy timeline, estimating fetal development stages, and can be useful for medical and personal record-keeping purposes.
Tips: Enter your estimated due date in the date field. The calculator will automatically compute and display your estimated conception date. Ensure the due date is accurate for the most reliable result.
Q1: How accurate is this calculation?
A: This provides an estimate based on average pregnancy duration. Actual conception dates may vary due to individual biological differences.
Q2: Why 266 days instead of 280?
A: Pregnancy is typically calculated as 280 days from the last menstrual period, but conception usually occurs about 14 days after that, resulting in 266 days from conception to due date.
Q3: Can this be used for IVF pregnancies?
A: For IVF pregnancies, the conception date is known precisely, so this calculator may not be necessary.
Q4: What if my cycles are irregular?
A: This calculation assumes a regular 28-day cycle. If your cycles are irregular, the estimated conception date may be less accurate.
Q5: How does this relate to ultrasound dating?
A: Ultrasound measurements in early pregnancy are often more accurate for dating than calculations based on last menstrual period.