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Pregnancy Due Date Calculation:
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The Pregnancy Due Date Calculator estimates the expected delivery date based on the last menstrual period using the standard New Zealand pregnancy calculation method. It provides an accurate assessment of pregnancy timeline and helps in prenatal care planning.
The calculator uses the standard due date calculation formula:
Where:
Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The due date represents the expected date of delivery.
Details: Accurate due date calculation is crucial for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify any potential complications.
Tips: Enter the first day of your last menstrual period in the date field. Ensure the date is accurate for the most precise due date calculation. The calculator uses the standard New Zealand healthcare approach.
Q1: How accurate is this due date calculation?
A: This method is the standard clinical approach used in New Zealand healthcare. However, only about 5% of babies are born exactly on their due date - most arrive within two weeks before or after.
Q2: What if my menstrual cycle is irregular?
A: If your cycles are longer or shorter than 28 days, an early pregnancy ultrasound may provide a more accurate due date estimate.
Q3: When should I confirm my pregnancy with a healthcare provider?
A: Contact your healthcare provider as soon as you have a positive pregnancy test to begin proper prenatal care.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, especially if there's a significant difference from the LMP-based calculation.
Q5: What are the trimesters of pregnancy?
A: Pregnancy is divided into three trimesters: First (weeks 1-13), Second (weeks 14-27), and Third (weeks 28-40+).