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FET Due Date Calculator

Calculate your due date and pregnancy milestones after frozen embryo transfer

Important Note

Due dates are estimates only. IVF pregnancies are closely monitored and delivery timing may be influenced by various factors. Your doctor will determine the actual delivery plan based on your specific circumstances. Twins or multiples will likely deliver earlier.

Enter Transfer Information

The date of your FET procedure

Most FETs use Day 5 or 6 blastocysts

Understanding FET Due Dates

How FET Due Dates Are Calculated

For frozen embryo transfers, we know the exact "conception" date. A Day 5 embryo is already 5 days old at transfer, so we count back 5 days and then subtract another 14 days to get the "last menstrual period" date used for pregnancy dating.

FET vs Fresh Transfer

  • FET allows for PGT testing and better endometrial preparation
  • Success rates often higher with FET
  • Lower risk of OHSS with freeze-all approach
  • Dating is equally accurate for both

Medication After FET

  • Progesterone support critical until placenta takes over (10-12 weeks)
  • Estrogen may be continued in medicated FET cycles
  • Baby aspirin often continued throughout pregnancy
  • Never stop medications without doctor's approval

Medical Sources

  • • ASRM. (2020). "Guidelines on number of embryos transferred." Fertility and Sterility
  • • Maheshwari et al. (2018). "Is frozen embryo transfer better?" Human Reproduction
  • • ACOG. (2021). "Methods for Estimating Due Date." Committee Opinion No. 700.