IVF Due Date Calculator

Your IVF due date is calculated by adding 266 days (38 weeks) to your egg retrieval date. Since a Day 5 embryo transfer occurs 5 days after retrieval, you add 261 days to a Day 5 transfer date. For a Day 3 transfer, you add 263 days, and for a Day 6 transfer, you add 260 days. This is more precise than a standard LMP-based due date because the fertilization date is known exactly.

The final due date is calculated similarly — 266 days from fertilization — but IVF allows a more precise calculation because the exact day of fertilization (egg retrieval) is known. With natural conception, the fertilization date is estimated, making IVF due dates generally more reliable from the start.

IVF due dates are considered highly accurate because the fertilization date is precisely known. However, only about 5% of babies are born on their exact due date. An early ultrasound at 7–10 weeks can confirm or adjust your due date. Most healthcare providers consider a birth between 37 and 42 weeks to be full term.

A Day 3 transfer uses a cleavage-stage embryo that is 3 days old at the time of transfer. A Day 5 transfer uses a blastocyst-stage embryo that has developed for 5 days, and is generally considered more developed. Day 5 (blastocyst) transfers are more common today because they often have higher implantation success rates. Your due date calculation differs by 2 days depending on which type you had.

At the moment of a Day 5 embryo transfer, you are considered 2 weeks and 5 days pregnant in gestational terms (since gestational age counts from the equivalent LMP date, which is 14 days before ovulation/retrieval, plus the 5 days of embryo development). Your gestational age increases each day from that point.

Research suggests that IVF pregnancies have a slightly higher rate of preterm birth compared to natural conceptions, though the majority of IVF babies are born at full term. Factors like multiple pregnancies (twins/triplets), maternal age, and underlying fertility issues can contribute to earlier delivery. Your doctor will monitor your pregnancy closely.

Yes, IVF pregnancy symptoms typically follow the same timeline as naturally conceived pregnancies. Symptoms like nausea, breast tenderness, and fatigue are driven by hormones (hCG and progesterone) that rise at similar rates regardless of how conception occurred. However, because IVF patients are often closely monitored, symptoms may be noticed or interpreted earlier.

Yes, your due date can be revised based on ultrasound findings, particularly during the first trimester. If the embryo is measuring significantly ahead or behind the expected size, your doctor may adjust your estimated due date. First-trimester ultrasounds are the most accurate for dating a pregnancy, even after IVF.