Due date from your embryo transfer, egg retrieval or IUI date
Updated October 2026
Enter the date the embryo went into the uterus, not the date the eggs were retrieved (unless you choose the retrieval option). The embryo’s age is in your clinic’s transfer report: "blastocyst" usually means day 5 or day 6, and "cleavage-stage" means day 3. For a frozen embryo transfer, the age at freezing is what counts; time in storage adds nothing. Choose the retrieval or IUI option for a fresh cycle dated from retrieval, or for intrauterine insemination, where fertilization is assumed on the procedure day.
The results give the due date, the LMP-equivalent date (the date your obstetric records count weeks from), how many weeks pregnant you were on transfer day, and the dates you reach 12, 20 and 39 weeks.
| Procedure | Days added to the procedure date | Gestational age that day |
|---|---|---|
| Egg retrieval, fresh fertilization or IUI | 266 | 2 weeks 0 days |
| Day-3 embryo transfer | 263 | 2 weeks 3 days |
| Day-5 blastocyst transfer | 261 | 2 weeks 5 days |
| Day-6 blastocyst transfer | 260 | 2 weeks 6 days |
ACOG Committee Opinion 700 (2017) gives the day-5 (261 days) and day-3 (263 days) examples and says pregnancies from assisted reproduction should be dated from the embryo’s age and transfer date. The day-6 and retrieval rows follow the same arithmetic: 266 days from fertilization minus the embryo’s age in days.
A day-5 blastocyst is already 5 days past fertilization, so it needs 266 − 5 = 261 more days. November 2, 2026 plus 261 days is July 21, 2027. Counting back 280 days from that due date gives the LMP-equivalent date, October 14, 2026, so on transfer day the pregnancy is dated 2 weeks 5 days. From that LMP-equivalent date, 12 weeks falls on January 6, 2027, 20 weeks on March 3, 2027 and 39 weeks on July 14, 2027.
| Procedure on November 2, 2026 | Due date | LMP-equivalent date | Dated on procedure day | 39 weeks |
|---|---|---|---|---|
| Egg retrieval, fresh fertilization or IUI | July 26, 2027 | October 19, 2026 | 2 weeks 0 days | July 19, 2027 |
| Day-3 embryo transfer | July 23, 2027 | October 16, 2026 | 2 weeks 3 days | July 16, 2027 |
| Day-5 blastocyst transfer | July 21, 2027 | October 14, 2026 | 2 weeks 5 days | July 14, 2027 |
| Day-6 blastocyst transfer | July 20, 2027 | October 13, 2026 | 2 weeks 6 days | July 13, 2027 |
An older embryo on the same calendar date means an earlier due date, by one day per day of embryo age.
With IVF the date of fertilization and the embryo’s age are known exactly, so the American College of Obstetricians and Gynecologists recommends assigning the due date from the transfer date and embryo age rather than from a last period or a later ultrasound. The pregnancy is still counted in weeks from an LMP-equivalent date about two weeks before fertilization, which is why a day-5 transfer day already counts as 2 weeks 5 days. The same rule applies to frozen embryo transfers: use the embryo’s age at transfer.
Counting from egg retrieval after a frozen transfer. Retrieval may have been months or years earlier; only the transfer date and embryo age matter. Choosing day 5 for a day-6 blastocyst moves the due date one day late. Expecting the date to change at the first scan. ACOG advises keeping the IVF-derived due date. Twins from a two-embryo transfer share the same due date, but twin pregnancies are more often delivered before it, and your care team plans that timing. Donor eggs or a gestational carrier change nothing in the math: the embryo’s age and transfer date still set the date.
A due date is not a sign that a pregnancy is progressing. Your fertility clinic confirms that with a blood hCG test and an early ultrasound on its own schedule. After a fertility treatment, report any vaginal bleeding, one-sided or severe belly pain, shoulder pain or fainting to your clinic right away, because an ectopic pregnancy can still occur after IVF. CDC’s urgent maternal warning signs (severe headache, vision changes, trouble breathing, chest pain, fever of 100.4°F or more) apply throughout pregnancy. Your obstetrician sets the official due date on your prenatal record.