1. What is the Pregnancy Date Calculator?

The When Did I Get Pregnant Calculator helps determine the approximate conception date based on your estimated due date (EDD). This calculation uses the standard medical formula that estimates conception occurred approximately 266 days before the due date.

2. How Does the Calculator Work?

The calculator uses the pregnancy calculation formula:

Where:

• \( \text{EDD} \) — Estimated Due Date (based on last menstrual period or ultrasound)
• \( 266 \text{ days} \) — Standard gestation period from conception to due date

Explanation: This calculation assumes a 38-week gestation period from conception to delivery, which is the standard medical timeframe used for dating pregnancies.

3. Importance of Knowing Conception Date

Details: Knowing your approximate conception date helps with pregnancy tracking, understanding fetal development milestones, and can be important for medical assessments and prenatal care planning.

4. Using the Calculator

Tips: Enter your estimated due date as provided by your healthcare provider. This is typically calculated from your last menstrual period or early ultrasound measurements.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides an estimate based on standard gestation periods. Actual conception dates can vary, and ultrasound dating is more accurate.

Q2: Why 266 days instead of 280 days?
A: 280 days is from last menstrual period to due date, while 266 days is from conception to due date, accounting for the typical 2-week difference.

Q3: Can this determine the exact day I got pregnant?
A: No, this provides an estimate. Conception can occur within a several-day window around the calculated date.

Q4: What if my cycles are irregular?
A: For irregular cycles, ultrasound dating is more reliable than calculations based on last menstrual period.

Q5: Should I use this for medical decisions?
A: Always consult with your healthcare provider for accurate pregnancy dating and medical advice.