1. What is IVF Pregnancy Week Calculation?

The IVF pregnancy week calculation provides an accurate method to determine gestational age after embryo transfer. Unlike natural conception, IVF pregnancies have a precisely known conception date, allowing for exact dating.

2. How Does the Calculator Work?

The calculator uses the standard IVF dating formula:

Where:

• Days Since Transfer — Number of days since embryo transfer procedure
• 14 — Represents the 2 weeks before conception (standard adjustment)
• 7 — Converts days to weeks

Explanation: The calculation adds 14 days to account for the 2 weeks prior to conception (standard pregnancy dating convention) and converts the total to weeks.

3. Importance of Accurate Dating

Details: Precise pregnancy dating is crucial for proper prenatal care, scheduling tests, and determining fetal growth benchmarks. IVF dating is more accurate than ultrasound dating in early pregnancy.

4. Using the Calculator

Tips: Enter the number of days since your embryo transfer procedure. The calculator will provide the equivalent pregnancy weeks using standard IVF dating conventions.

5. Frequently Asked Questions (FAQ)

Q1: Why add 14 days to the calculation?
A: This accounts for the 2 weeks prior to conception (standard pregnancy dating convention that counts from the first day of the last menstrual period).

Q2: Does this work for fresh and frozen transfers?
A: Yes, the calculation works the same way for both fresh and frozen embryo transfers.

Q3: How does this compare to natural conception dating?
A: IVF dating is more precise since we know the exact conception date, while natural conception dating estimates based on LMP.

Q4: When should I start counting from?
A: Count from the day of your embryo transfer (day 0 is transfer day).

Q5: What if I had a day 3 vs day 5 transfer?
A: The calculation remains the same regardless of whether it was a cleavage-stage (day 3) or blastocyst (day 5) transfer.