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IVF FET Due Date Calculator

Calculate your estimated due date and pregnancy milestones after Frozen Embryo Transfer (FET). This calculator helps you track key dates throughout your IVF pregnancy journey.

Enter the date when your embryo transfer procedure was performed

How to Use This Calculator

  1. Enter the date of your embryo transfer procedure
  2. Select the age of the embryo at the time of transfer (3 days, 5 days, or 6 days)
  3. Check the box if you want to see additional pregnancy milestone dates
  4. Click "Calculate Due Date" to see your estimated due date and pregnancy timeline

Formula Used

Due Date = Transfer Date + Gestational Duration

Where:

  • For 3-day embryo: Gestational Duration = 266 days
  • For 5-day embryo: Gestational Duration = 261 days
  • For 6-day embryo: Gestational Duration = 260 days

This calculation accounts for the standard 40-week pregnancy (280 days) minus the age of the embryo at transfer, as the embryo's age is already factored into its development.

Example Calculation

Real-World Scenario:

Sarah underwent a Frozen Embryo Transfer on March 15, 2023, with a 5-day blastocyst embryo. She wants to know her estimated due date and key pregnancy milestones.

Given:

  • Transfer Date = March 15, 2023
  • Embryo Age = 5 days (blastocyst)

Calculation:

Due Date = Transfer Date + 261 days

Due Date = March 15, 2023 + 261 days

Result: Estimated due date is November 30, 2023. Key milestones include: End of first trimester (June 14, 2023), Viability date (September 14, 2023), and Full-term date (November 16, 2023).

Why This Calculation Matters

Practical Applications

  • Planning prenatal care appointments
  • Preparing for maternity leave and work arrangements
  • Scheduling important prenatal tests and screenings
  • Tracking baby's development milestones
  • Planning for nursery preparation and baby supplies

Key Benefits

  • Provides accurate dating specific to IVF pregnancies
  • Reduces anxiety by providing clear timeline expectations
  • Helps healthcare providers monitor fetal growth accurately
  • Assists in planning for potential early delivery
  • Supports emotional preparation for parenthood journey

Common Mistakes & Tips

One of the most common mistakes is using the wrong embryo age at transfer. A 3-day embryo requires adding 266 days, while a 5-day blastocyst requires adding 261 days. Using the wrong value will result in an inaccurate due date. Always confirm the exact age of your embryo with your fertility specialist before calculating.

Many people mistakenly use the egg retrieval date instead of the embryo transfer date. The transfer date is when the embryo is actually transferred to the uterus, which is the correct starting point for calculating the due date. For FET cycles, there may be a significant time gap between retrieval and transfer, so using the retrieval date will lead to incorrect calculations.

If multiple embryos are transferred and more than one implants, the pregnancy may have different milestones and potential delivery dates. Twins or triplets often deliver earlier than singletons. While this calculator provides an estimate based on standard gestation, your healthcare provider will adjust your due date if you're carrying multiples based on ultrasound measurements and other factors.

Frequently Asked Questions

This calculator provides a highly accurate estimate for IVF pregnancies because the exact date of embryo transfer is known, unlike natural conception where the exact conception date may be uncertain. The calculation method used is the standard approach recommended by fertility specialists. However, only about 5% of babies are born on their exact due date, with most delivering between 37 and 42 weeks.

Your initial due date calculated from the embryo transfer is typically very accurate, but your healthcare provider may adjust it based on early ultrasound measurements. In IVF pregnancies, due dates are rarely changed by more than a few days, as the dating is more precise than in naturally conceived pregnancies. Any adjustments would be based on the baby's growth measurements and development milestones observed during ultrasounds.

The calculation method is the same for both fresh and frozen embryo transfers. The key factors are the date of transfer and the age of the embryo at transfer, not whether the embryo was fresh or frozen. The gestational age calculation always starts from the embryo transfer date, adjusted for the embryo's age at transfer. This calculator works for both fresh and frozen embryo transfers.

To calculate your current week of pregnancy, count the number of days from your embryo transfer date to today, add the embryo's age at transfer (3, 5, or 6 days), and then divide by 7 to get the number of weeks. For example, if you had a 5-day embryo transfer 35 days ago, you would be (35 + 5) ÷ 7 = 5.7 weeks pregnant, or in your 6th week of pregnancy. This calculator shows your current week of pregnancy in the results section.

References & Disclaimer

Medical Disclaimer

This calculator provides estimates based on standard medical calculations for IVF pregnancies. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding your pregnancy. Do not disregard professional medical advice or delay in seeking it because of something you have read here.

References

Accuracy Notice

This calculator provides estimates based on standard medical calculations for IVF pregnancies. While highly accurate due to the precise knowledge of embryo transfer date, individual factors may affect the actual delivery date. Only about 5% of babies are born on their exact due date, with most delivering between 37 and 42 weeks. Your healthcare provider will monitor your pregnancy and may adjust your due date based on ultrasound measurements and fetal development.

About the Author

Kumaravel Madhavan

Web developer and data researcher creating accurate, easy-to-use calculators across health, finance, education, and construction and more. Works with subject-matter experts to ensure formulas meet trusted standards like WHO, NIH, and ISO.

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