Do the same for the date being used for a frozen egg as well. This would be the approximate date of last menstrual cycle for the woman donating the egg. Since the natural cycle of the surrogate mother doesnt matter (her eggs are not being used), you should back up fifteen days from the date of egg retrieval and use that date. In order to determine the estimated due date, you still need a date to serve as the last menstrual period date. If the donated egg was frozen, then the date it was placed in the surrogate’s body minus three days will serve as the date used to calculate the babys due date. Rather, the date that the egg was removed from the biological mother is what matters.įor instance, if a man is using his own sperm and a donated fresh egg to create a baby with a surrogate mother, the date that the egg was retrieved from the donor would be the basis of calculating the babys due date. Since the biological mother of the baby is not the woman carrying the baby to term, the first day of the last menstrual cycle of the carrier does not matter. Many parents appreciate that, since the calculations for gestational due dates are a bit more complicated. These dates can later be confirmed through an ultrasound.Ĭalculating Conception Date: Gestational SurrogacyĪ IVF due date calculator can be used to quickly estimate the due date for a gestational surrogate pregnancy. ![]() Doctors typically use paper wheels to estimate due dates just as quickly. When using a due date calculator, the date is calculated in this manner and instantly delivered. 40 weeks is 280 days, so the estimated due date will be 280 days after the first day of the last menstrual cycle. In many cases, an early ultrasound will be used to date the pregnancy.įor a woman with a regular 28 day cycle, 40 weeks will be counted out from the first day of the last menstrual cycle. When the biological mother does not have a normal menstrual cycle, or her cycles are not regular, then a medical professional may need to do more extensive calculations to estimate the due date for the pregnancy. The length of the womans menstrual cycleĪ due date calculator will work off of a normal menstrual cycle length, which is 28 days. ![]()
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