![]() ![]() However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, can also be a factor in pinpointing the EDD. Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception.An alternative calculation is by adding 38 weeks to the date of transfer and subtract the age of embryos from this date. Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date. The IVF due date is calculated by adding 38 weeks (i.e., 266 days) to the day the eggs were inseminated. Pregnancy milestones such as the first time the baby's heartbeat is detected (around week 9 or 10, though it can vary) and when you first feel fetal movement (on average between 18 and 22 weeks, but it can be earlier or later), can give clues as to whether your due date is accurate. Other clues can help your health care provider figure out how far along you are and better pinpoint your due date at your prenatal check-ups. Enter your last period date or your IVF egg pickup date. Some practitioners perform them routinely, but others only recommend one if your periods are irregular, you're 35 or older, you have a history of miscarriages or pregnancy complications, or the due date can’t be determined based on your physical exam and LMP. Just be aware, however, that not all women get an early ultrasound. Just choose "ultrasound" from our Due Date Calculator choices. The timing of an early ultrasound can sometimes more accurately date the pregnancy than your LMP and other methods. Even if you can’t pinpoint when you conceived, forget the day of your last menstrual period, or aren’t sure when ovulation occurred, the date of an early ultrasound, if you have one, can help your practitioner determine your due date at your first prenatal appointment or another prenatal visit in your first trimester. A pregnancy Due Date Calculator is a tool that evaluates the due date (date of delivery or giving birth) of a pregnant woman.
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