1. What is Pregnancy Week Calculator?

The Pregnancy Week Calculator determines how far along a pregnancy has progressed based on the first day of the last menstrual period (LMP). It provides the current gestational age in weeks and days, and estimates the due date.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy dating formula:

Where:

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

Explanation: Pregnancy is typically calculated as 40 weeks (280 days) from the first day of the last menstrual period. This calculator shows the current progress toward that 40-week mark.

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 if interventions are needed for post-term pregnancies.

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 your current pregnancy week and estimated due date.

5. Frequently Asked Questions (FAQ)

Q1: Why calculate from LMP instead of conception?
A: LMP is more reliably known than conception date for most women, so it's the standard reference point in obstetrics.

Q2: What if my cycles aren't regular?
A: This calculator assumes a 28-day cycle. If your cycles are significantly longer/shorter, an ultrasound dating scan may be more accurate.

Q3: How accurate is the due date?
A: Only about 5% of women deliver on their exact due date. It's an estimate, with most births occurring within 2 weeks before or after.

Q4: What's considered full term?
A: 39-40 weeks is full term. 37-38 weeks is early term, and 41-42 weeks is late term.

Q5: When should I see a doctor?
A: Schedule your first prenatal visit as soon as you have a positive pregnancy test, typically around 8 weeks gestation.