1. What is Pregnancy Week Calculation?

Pregnancy week calculation determines the current stage of pregnancy based on the last menstrual period (LMP) and current date. This method is widely used in obstetrics to track fetal development and schedule prenatal care.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy dating formula:

Where:

• \( Stage \) — Pregnancy stage in completed weeks
• \( Current\ Date \) — Today's date or specified date
• \( LMP \) — First day of last menstrual period
• \( \lfloor \rfloor \) — Floor function (rounding down)

Explanation: The calculation counts 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 Stage Tracking

Details: Accurate pregnancy dating is essential for monitoring fetal development, scheduling prenatal tests, determining due date, and identifying potential complications. It helps healthcare providers deliver appropriate care at each trimester.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will determine how many complete weeks of pregnancy have passed. Ensure dates are entered in the correct format.

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 pregnancy dating used by healthcare providers worldwide.

Q2: How accurate is this calculation?
A: This method provides a good estimate, but ultrasound dating in early pregnancy (especially first trimester) is more accurate for determining gestational age.

Q3: What if I don't know my exact LMP?
A: If LMP is uncertain, an early pregnancy ultrasound provides the most accurate dating. Consult your healthcare provider for precise assessment.

Q4: How is pregnancy typically divided?
A: Pregnancy is divided into three trimesters: First (weeks 1-13), Second (weeks 14-27), and Third (weeks 28-40+).

Q5: When is the estimated due date?
A: Estimated due date is typically 40 weeks from LMP, calculated as LMP + 280 days (Naegele's rule).