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Pregnancy Calculation Formula:
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The Pregnancy Calculator By Date Of Intercourse estimates conception date and due date based on the date of sexual intercourse. This method assumes conception occurred on the same day as intercourse and calculates the estimated due date by adding 266 days.
The calculator uses the following formula:
Where:
Explanation: This calculation assumes that conception occurs on the day of intercourse and uses the standard 266-day gestation period from conception to estimated due date.
Details: Accurate pregnancy dating is crucial for monitoring fetal development, scheduling prenatal care, and determining the appropriate timing for delivery. It helps healthcare providers track pregnancy progress and identify any potential issues.
Tips: Enter the exact date of intercourse. The calculator will provide the conception date (same as intercourse date) and the estimated due date. Remember that this is an estimate and actual delivery dates may vary.
Q1: How accurate is this calculation method?
A: This method provides a good estimate but actual conception may occur within 24-48 hours after intercourse. The estimated due date is typically within ±2 weeks of actual delivery.
Q2: Why 266 days instead of 280 days?
A: 280 days is calculated from the first day of the last menstrual period (LMP), while 266 days is from conception date. This calculator uses the conception-based method.
Q3: What if I don't know the exact intercourse date?
A: If the exact date is unknown, other methods like last menstrual period dating or ultrasound measurements may provide more accurate estimates.
Q4: Does this work for IVF or fertility treatments?
A: For assisted reproduction, the conception date is precisely known, making this method very accurate for calculating due dates.
Q5: When should I confirm with a healthcare provider?
A: Always confirm pregnancy dating with a healthcare provider who may use additional methods like ultrasound for more precise dating.