FET Due Date Calculator - Frozen Embryo Transfer
Calculate your due date from frozen embryo transfer (FET) with pregnancy milestones for IVF pregnancies. Free, accurate, and instant results for Day 3, 5, or 6 embryo transfers.
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
Frequently Asked Questions
How do I calculate due date from frozen embryo transfer?
To calculate your due date from FET, subtract the embryo age (3, 5, or 6 days) from your transfer date to get the conception date. Then subtract 14 more days to get your "last menstrual period" (LMP). Your due date is 280 days from that LMP date. Our calculator does this automatically for you.
Is the FET due date calculator accurate?
Yes, FET due date calculations are highly accurate because we know the exact conception date. Unlike natural pregnancy where ovulation is estimated, with FET we know precisely when the embryo was created and transferred. However, actual delivery can vary by ±2 weeks from the due date.
What is the difference between Day 3 and Day 5 embryo transfer due dates?
Day 5 embryo transfers result in a due date 2 days earlier than Day 3 transfers because the embryo is already 5 days old at transfer (vs 3 days old). This means your pregnancy is technically "further along" with a Day 5 transfer. The calculator automatically adjusts for embryo age.
When should I take a pregnancy test after FET?
Most clinics schedule a beta HCG blood test 9-10 days after a Day 5 FET (11-12 days after Day 3 FET). Home pregnancy tests may show positive as early as 5-6 days post-transfer, but blood tests are more accurate for early detection.
How is IVF pregnancy due date different from natural pregnancy?
The due date is calculated the same way (280 days from LMP), but with IVF we know the exact conception date. Natural pregnancies estimate conception as 14 days after LMP. With FET, we calculate backwards from the known transfer date to determine the equivalent LMP date.
Will my IVF doctor use a different due date?
Your fertility clinic and OB should use the same due date calculated from your transfer date. Early ultrasounds may refine the due date by ±3 days, but FET dating is already very accurate. Always follow your doctor's dates if they differ from calculator results.
Do twins from FET deliver earlier than singletons?
Yes, twin pregnancies typically deliver 3-4 weeks before the full-term due date (37-38 weeks vs 40 weeks for singletons). Your OB will monitor you closely and may recommend delivery at 37-38 weeks for twins to reduce complications.
How long do I continue progesterone after FET?
Most clinics continue progesterone supplementation until 10-12 weeks of pregnancy, when the placenta takes over progesterone production. Never stop medications without your doctor's approval, as stopping too early can risk pregnancy loss.
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.