IVF due date calculator
After IVF, your due date is 261 days after a day-5 embryo transfer, 260 days after a day-6 transfer, or 263 days after a day-3 transfer. It is the same for fresh and frozen transfers. Enter your date below.
How IVF due dates work
A natural pregnancy is dated from the first day of the last period, about 14 days before conception, and lasts about 280 days from that point. After IVF, the day of fertilisation is known, so clinics count back to the same starting point. A day-5 embryo was fertilised 5 days before transfer, so the due date is 266 minus 5, which is 261 days after transfer.
| Treatment | Due date |
|---|---|
| Day-3 transfer | Transfer + 263 days |
| Day-5 transfer | Transfer + 261 days |
| Day-6 transfer | Transfer + 260 days |
| Egg retrieval or IUI | Date + 266 days |
After a positive test
Your clinic will usually check your hCG level and then book an early scan at around 6 to 7 weeks to see the heartbeat. Most clinics then hand your care over to an obstetrician at around 8 to 12 weeks. Follow your baby's development in our week-by-week guide.
IVF due date questions
How is an IVF due date calculated?
From your embryo transfer date: add 261 days for a day-5 (blastocyst) transfer, 260 days for a day-6 transfer and 263 days for a day-3 transfer. From the egg retrieval date, or after IUI, add 266 days.
Is the due date different for a frozen embryo transfer?
No. Use the transfer date and the age of the embryo when it was frozen. A frozen day-5 blastocyst gives a due date 261 days after the transfer.
Why does my clinic say I'm 4 weeks pregnant on test day?
Doctors count every pregnancy from an imaginary last period two weeks before conception, so IVF pregnancies line up with natural ones. A positive test around 9 to 11 days after a day-5 transfer is about 4 weeks of pregnancy.
Is an IVF due date more accurate?
Yes. Because the exact date of conception is known, IVF dates are very accurate, and they usually aren't changed after the dating scan.