1. What is Pregnancy Weeks Calculation?

Pregnancy weeks calculation determines how far along a pregnancy is by counting the time elapsed since the first day of the last menstrual period (LMP). This is the standard method used by healthcare providers to track pregnancy progress.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy dating formula:

Where:

• Current Date — Today's date or any date you want to check
• LMP Date — First day of last menstrual period

Explanation: Pregnancy is calculated from the first day of your last period because ovulation and conception dates are often unknown, while LMP is typically remembered.

3. Importance of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for proper prenatal care, scheduling important tests, determining due date, and identifying potential growth problems.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (defaults to today). The calculator will show complete weeks plus remaining days.

5. Frequently Asked Questions (FAQ)

Q1: Why count from LMP instead of conception?
A: Most women know their LMP but not conception date. By convention, pregnancy is 40 weeks from LMP (38 weeks from conception).

Q2: What if my cycles aren't 28 days?
A: This calculator assumes standard 28-day cycles. If your cycles are longer/shorter, consult your doctor for adjusted dating.

Q3: When should I get my first ultrasound?
A: First trimester ultrasound (8-12 weeks) provides most accurate dating and should confirm LMP-based calculation.

Q4: What if I don't remember my LMP?
A: An early ultrasound can estimate gestational age. Later in pregnancy, dating becomes less accurate.

Q5: How accurate is this calculation?
A: For women with regular cycles, it's quite accurate (±1 week). Irregular cycles or uncertain LMP reduce accuracy.