1. What is Pregnancy Week Calculation?

Pregnancy week calculation determines the current gestational age based on the last menstrual period (LMP) date. This is the standard method used by healthcare providers to track pregnancy progression and estimate due dates.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy week formula:

Where:

• \( Current Date \) — Today's date or any specified date
• \( LMP \) — First day of last menstrual period
• \( \lfloor \rfloor \) — Floor function (rounds down to nearest integer)

Explanation: The calculation counts the number of complete weeks that have passed since the first day of the last menstrual period.

3. Importance of Pregnancy Week Tracking

Details: Accurate pregnancy week calculation is essential for monitoring fetal development, scheduling prenatal appointments, performing appropriate tests at correct times, and estimating the due date.

4. Using the Calculator

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

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 reference point that healthcare providers universally use.

Q2: What if I don't know my exact LMP date?
A: Use your best estimate. An ultrasound in early pregnancy can provide a more accurate gestational age if LMP is uncertain.

Q3: How accurate is this calculation?
A: Very accurate for women with regular 28-day cycles. Variations may occur with irregular cycles or uncertain LMP dates.

Q4: When does pregnancy week counting start?
A: Pregnancy is counted from the first day of your last menstrual period, which is typically about 2 weeks before actual conception occurs.

Q5: Can this calculator predict my due date?
A: Yes, add 280 days (40 weeks) to your LMP date to estimate your due date using Naegele's rule.