![]() ![]() Influencing FactorsĪ number of studies have evaluated average gestation length as it relates to different factors, like age, race, pregnancy history, and more. In short, it is common to deliver a few weeks before to one week after your due date, and true due date changes are less common and should be made by a provider based on all of the information they have available to them. Ultrasound-determined due dates are most accurate during the first trimester, and measuring ‘ahead’ doesn’t result in a changed due date in most cases. It is important to rely on the expertise of your OBGYN or other physician to help you understand how your due date was calculated, what outliers like a fundal height that is measuring ahead might mean for you (fundal height is the distance from the pubic bone to the top of the uterus measured in centimeters), and what you can expect when it comes to gestational length. your due date was determined by fetal Doppler or an ultrasound in the second or third trimester these are less accurate ways to estimate the due date.your fundal height is off, especially if it is off by more than 3 cm.your ultrasound-predicted due date is more than a week from your menstrual-cycle due date. ![]() Some of the most common signs that your due date might be off are: If you don’t know the first date of your last menstrual period, you don’t know your average cycle length, or you have mistaken bleeding during pregnancy for menstruation, your assumed due date can be inaccurate. This blog post explores signs that your due date might be off, factors that can influence an inaccurate due date, and how to estimate your due date based on your menstrual cycle. Trying to determine when you are due and whether that due date is correct, can be challenging, especially if you feel “bigger” than you did with previous pregnancies or you are measuring ahead during your appointments.
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