How IVF Due Dates Are Calculated

Unlike natural conception, IVF pregnancies have a precisely known conception date, making due date calculation more accurate. Our IVF transfer due date calculator works for both single pregnancies and twins.

• Day 3 Embryos (Cleavage Stage): Add 263 days (37 weeks + 4 days) to the transfer date
• Day 5 Embryos (Blastocyst): Add 261 days (37 weeks + 2 days) to the transfer date
• Day 6 Embryos (Blastocyst): Add 260 days (37 weeks + 1 day) to the transfer date

This 5 day IVF transfer due date calculator accounts for the embryo’s development prior to transfer and follows the standard 40-week pregnancy timeline from the last menstrual period in natural conception.

Important Notes About IVF Due Dates

While our IVF transfer due date calculator provides an accurate estimate based on your transfer date and embryo stage, keep in mind:

• Only about 5% of babies are born on their exact due date
• IVF pregnancies have a slightly higher rate of cesarean deliveries, which may affect timing
• Your doctor may adjust your due date slightly based on early ultrasound measurements
• Multiple pregnancies (twins, triplets) often deliver earlier than singleton pregnancies

Always consult with your fertility specialist about your specific situation and expected delivery timeline.

Frequently Asked Questions

Why is my IVF due date different from a natural pregnancy calculation?

In natural pregnancies, the due date is calculated from the first day of your last menstrual period (LMP), assuming ovulation occurred on day 14. With IVF, we know the exact conception date (embryo transfer date) and embryo age, allowing for more precise calculation with our IVF transfer due date calculator.

Will my doctor change my due date after the first ultrasound?

Most IVF due dates remain unchanged after ultrasound because the conception date is known. However, if there’s a significant discrepancy (more than 5-7 days) between the ultrasound measurements and your calculated due date from our IVF transfer due date calculator, your doctor may adjust it slightly.

Do twins or multiples have the same due date as a single pregnancy?

While the calculated due date from our IVF transfer due date calculator is the same, multiple pregnancies often deliver earlier. About 60% of twins are born before 37 weeks, compared to 10% of singleton pregnancies.