An IVF due date is calculated using the embryo transfer date. For a Day 3 embryo transfer, the due date is 263 days from the transfer date. For a Day 5 blastocyst transfer, it's 261 days from the transfer date. This method is more precise than using the last menstrual period (LMP) because the exact date of conception is known.

Your gestational age after IVF is calculated from the date of embryo transfer. If you had a Day 5 transfer, you are considered 2 weeks and 5 days pregnant on the day of the transfer. For a Day 3 transfer, you are 2 weeks and 3 days pregnant. Your clinic will provide the most accurate timeline.

Yes, the method for calculating the due date is different and more accurate with IVF. Instead of using the last menstrual period (LMP), which can be unreliable with irregular cycles, the IVF due date is based on the precise date of the embryo transfer, leading to a more reliable estimate.

Just like babies conceived naturally, only a small percentage of IVF babies are born on their exact due date. However, because the date of conception is known, the estimated due date for an IVF pregnancy is generally considered more accurate. Many factors can influence the actual delivery date.

A full-term pregnancy is around 40 weeks, and this is the same for an IVF pregnancy. A pregnancy is typically confirmed 'successful' with a positive blood test (hCG) about 9-11 days after the embryo transfer, followed by a viability scan with a heartbeat at 6-7 weeks. For more detailed information, you can consult trusted sources like the American College of Obstetricians and Gynecologists (ACOG).