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Pregnancy Week Calculation:
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The Baby Weeks Calculator estimates the current week of pregnancy based on the Last Menstrual Period (LMP). It provides week-by-week tracking of fetal development and helps monitor pregnancy progress accurately.
The calculator uses the standard pregnancy dating formula:
Where:
Explanation: Pregnancy is typically calculated from the first day of your last menstrual period, as this is easier to track than conception date.
Details: Accurate week tracking is essential for monitoring fetal development, scheduling prenatal appointments, performing necessary tests at correct times, and preparing for delivery.
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 exactly how many weeks pregnant you are on that specific date.
Q1: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because most women can recall their last period date more accurately than conception date, providing a consistent starting point for calculation.
Q2: How accurate is this calculation method?
A: This method is standard in obstetrics and provides a reliable estimate, though ultrasound dating may be more accurate, especially if periods are irregular.
Q3: What if I don't know my exact LMP date?
A: Use your best estimate. An early pregnancy ultrasound can provide more accurate dating if LMP is uncertain.
Q4: Does this calculator account for irregular cycles?
A: This calculator assumes a standard 28-day cycle. Women with irregular cycles may need ultrasound confirmation for accurate dating.
Q5: When should I see a healthcare provider?
A: Schedule your first prenatal appointment around 8 weeks of pregnancy, or as soon as you get a positive pregnancy test for initial guidance.