1. What Is Pregnancy Week Calculation?

Pregnancy week calculation determines the current gestational age based on the last menstrual period (LMP). This method is widely used in obstetrics to track fetal development and estimate the due date.

2. How Does The Calculator Work?

The calculator uses the pregnancy week formula:

Where:

• \( WP \) — Pregnancy week (weeks)
• \( CD \) — Current date (date)
• \( LMP \) — Last menstrual period (date)

Explanation: The calculation determines the number of complete weeks that have passed since the first day of the last menstrual period, providing the current gestational age.

3. Importance Of Pregnancy Week Tracking

Details: Accurate pregnancy week calculation is essential for monitoring fetal development, scheduling prenatal tests, estimating due date, and ensuring appropriate medical care throughout pregnancy.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period and the current date. The calculator will determine your current pregnancy week and days within that week.

5. Frequently Asked Questions (FAQ)

Q1: Why is LMP used instead of conception date?
A: LMP is more reliably known than conception date and provides a standardized method for calculating gestational age across medical practice.

Q2: What if my cycle is irregular?
A: For irregular cycles, early ultrasound dating is more accurate. LMP calculation assumes a regular 28-day cycle.

Q3: How accurate is this calculation?
A: LMP dating is generally accurate within ±2 weeks. First-trimester ultrasound provides the most precise dating.

Q4: When should I see a doctor for confirmation?
A: Schedule your first prenatal appointment around 8 weeks gestation for confirmation and comprehensive pregnancy care.

Q5: Can this calculator predict my due date?
A: Yes, estimated due date is typically 40 weeks from LMP. Add 280 days to your LMP for due date estimation.