1. What is Pregnancy Weeks Calculation?

Pregnancy weeks calculation determines how far along a pregnancy has progressed based on the first day of the last menstrual period (LMP). This is the standard method used by healthcare providers to estimate gestational age.

2. How Does the Calculator Work?

The calculator uses the pregnancy weeks formula:

Where:

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

Explanation: The calculation counts the number of days between the LMP and current date, then converts to weeks by dividing by 7.

3. Importance of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for proper prenatal care, scheduling tests at appropriate times, monitoring fetal growth, and determining the due date.

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 how many weeks pregnant you are.

5. Frequently Asked Questions (FAQ)

Q1: What if I don't know my LMP?
A: If you don't know your LMP, an ultrasound in early pregnancy can estimate gestational age based on fetal measurements.

Q2: Is this calculation accurate for everyone?
A: This assumes a regular 28-day cycle with ovulation around day 14. Irregular cycles may affect accuracy.

Q3: How is this different from fetal age?
A: Gestational age (what this calculates) is about 2 weeks more than fetal age, since it counts from LMP rather than conception.

Q4: What's considered full term?
A: Full term is 39-40 weeks. Babies born between 37-42 weeks are considered term.

Q5: When should I see a doctor?
A: Schedule your first prenatal visit when you get a positive pregnancy test, typically around 8 weeks gestational age.