Your estimated due date
Your clinic will tell you when to take your blood pregnancy test, usually around 9 to 14 days after transfer.
How is an IVF due date calculated?
With IVF the date of fertilisation is known, so the due date is more precise than one based on a last period. A pregnancy lasts about 266 days from fertilisation. Because a transferred embryo is already a few days old, the calculator subtracts the embryo's age:
- Egg retrieval or insemination: date + 266 days
- 3-day embryo transfer: transfer date + 263 days
- 5-day embryo transfer: transfer date + 261 days
- 6-day embryo transfer: transfer date + 260 days
The same rule applies to frozen embryo transfers: use the transfer date and the age of the embryo when it was frozen.
How far along am I after an embryo transfer?
Pregnancy is still counted as if it started two weeks before fertilisation, the same way as a natural pregnancy. So on the day of a 5-day transfer you are counted as 2 weeks and 5 days pregnant. This lets your doctors use the same week-by-week milestones as any other pregnancy.
Frequently asked questions
Does this work for a frozen embryo transfer (FET)?
Yes. Enter the date of the frozen transfer and choose the embryo's age at the time it was frozen, usually day 5 or day 6.
Will my clinic give a different due date?
It should be the same or within a day or two. Always follow the due date your clinic or doctor gives you.
When should I take a pregnancy test after transfer?
Most clinics book a blood test about 9 to 14 days after transfer. Home tests taken earlier can give false results, especially if you had a trigger injection.
Is my information saved?
No. The calculation runs in your browser and nothing is stored.