IVF Due Date Calculator

What is an IVF Pregnancy Calculator?

An IVF Pregnancy Calculator helps estimate your due date when you conceive through in vitro fertilization (IVF). Unlike natural conception, where the due date is based on the last menstrual period (LMP) or ovulation, IVF pregnancies have more precise conception dates, making due date predictions more accurate.

How is the Due Date Calculated for IVF Pregnancies?

For IVF pregnancies, the due date is determined based on the embryo transfer date rather than the LMP. This method is more precise because doctors know the exact date when the embryo was implanted. Here’s how it works:

• Day 3 Embryo Transfer: If you had a 3-day-old embryo transferred, your due date is calculated by adding 266 days (or 38 weeks) from the egg retrieval or fertilization date.
• Day 5 Embryo Transfer: If you had a 5-day-old embryo transferred, your due date is calculated by adding 261 days (or 37 weeks and 2 days) from the egg retrieval or fertilization date.

Alternatively, the due date can be estimated by subtracting 17 days (for a 3-day transfer) or 19 days (for a 5-day transfer) from the embryo transfer date and then adding 280 days (or 40 weeks) to get the estimated due date.

Why is the IVF Due Date More Accurate?

IVF pregnancies have a more precise timeline because:

• The exact date of egg retrieval, fertilization, and embryo transfer is known.
• Unlike natural conception, where ovulation can vary, IVF pregnancies have a controlled fertilization and implantation process.
• The due date is not based on assumptions about ovulation or menstrual cycle length, which vary in natural conception.

Important Pregnancy Milestones with IVF

• First Ultrasound (6-8 weeks): Confirms the pregnancy and detects the baby’s heartbeat.
• NT Scan (11-14 weeks): Screens for chromosomal conditions.
• Anatomy Scan (18-20 weeks): A detailed scan to check the baby’s development.
• Viability Milestone (24 weeks): The baby has a higher chance of survival if born prematurely.
• Full-Term Pregnancy (37-40 weeks): The safest period for delivery.

Things to Remember About Your IVF Due Date

• Only about 5% of babies are born exactly on their due date.
• IVF pregnancies may have a higher chance of an earlier delivery, especially with twins or multiples.
• Your doctor may adjust the due date based on ultrasound measurements, especially in the first trimester.

Conclusion

The Pregnancy Calculator by IVF gives an accurate estimate of when your baby will arrive. Since IVF allows for precise tracking of fertilization and implantation, the due date is more reliable than LMP-based calculations. However, every pregnancy is unique, so regular checkups with your doctor will help monitor the baby’s growth and expected delivery timing.

Use our IVF Pregnancy Calculator to determine your due date and track your pregnancy journey with confidence!

• Moore, Keith. 2015. “How accurate are ‘due dates’?” BBC, February 3, 2015. www.bbc.com/news/magazine-31046144.
• Wikipedia: The Free Encyclopedia. 2017. en.wikipedia.org/wiki/Pregnancy.
• PubMed Health. 2014. “Pregnancy and birth: When your baby’s due date has passed.” www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072755/.