1. What is the Pregnancy Calculator?

The Pregnancy Calculator estimates the due date (EDD) based on the last menstrual period (LMP) using Naegele's rule. This is the standard method used by healthcare providers to determine the estimated delivery date.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy due date formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — First day of Last Menstrual Period
• \( 280 \text{ days} \) — Standard pregnancy duration (40 weeks)

Explanation: The calculation adds 280 days (40 weeks) to the first day of your last menstrual period, which corresponds to approximately 38 weeks of fetal development.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, scheduling important tests, and preparing for delivery.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will provide your estimated due date and current gestational age.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this due date calculation?
A: This method is accurate for women with regular 28-day cycles. Only about 5% of women deliver on their exact due date.

Q2: What if I have irregular periods?
A: For irregular periods, an early ultrasound dating is more accurate for determining the due date.

Q3: Why is the calculation based on LMP and not conception date?
A: LMP is used because most women can recall their last period date more accurately than conception date.

Q4: What is considered full term?
A: Full term is between 39 weeks 0 days and 40 weeks 6 days. Early term is 37-38 weeks, late term is 41-41+6 weeks.

Q5: Should I rely solely on this calculator for medical decisions?
A: No, this tool is for educational purposes. Always consult with your healthcare provider for medical advice and confirm your due date through clinical assessment.