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Pregnancy Week Calculation:
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The Pregnancy Calculator Wheel Week By Week is a tool that calculates the current week of pregnancy based on the last menstrual period (LMP) and current date. It provides accurate week-by-week tracking of pregnancy progression using standard obstetric calculation methods.
The calculator uses the standard pregnancy week calculation formula:
Where:
Explanation: This calculation follows standard obstetric practice where pregnancy is calculated from the first day of the last menstrual period, not from conception.
Details: Accurate pregnancy dating is essential for monitoring fetal development, scheduling prenatal tests, determining due date, and ensuring appropriate medical care throughout pregnancy.
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 the exact pregnancy week. Ensure dates are entered in the correct format.
Q1: Why calculate from LMP instead of conception?
A: Obstetric dating traditionally uses LMP because it's easier to recall and provides a standardized method for healthcare providers worldwide.
Q2: What if I don't know my exact LMP?
A: If unsure about LMP, an ultrasound in early pregnancy can provide more accurate dating based on fetal measurements.
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: What is considered full-term pregnancy?
A: Full-term is 39-40 weeks. Delivery between 37-42 weeks is considered term, while before 37 weeks is preterm.
Q5: Can this calculator predict my due date?
A: Yes, estimated due date is typically 40 weeks from LMP. Add 280 days (40 weeks) to your LMP for due date estimation.