Your wrong date is important for many dating. A gentle warning is that menstrual cycles are seldom that regular. Normal cycles can be between 21 to 35 days with some women outside of this guideline. Regularity is seldom that common and there is a fair chance the calculation will be off. But we still use your LMP as a guideline because the beginning of a period is an identifiable event where ovulation and fertilisation is not. It is very common when scanning an early pregnancy to find that the due date does not match the menstrual history.

Sometimes the dates can be more than a week off and sometimes even as much as 4 weeks. An early obstetric ultrasound performed at approximately 8 weeks where a crown rump length the CRL is measured precisely predicts an estimated due date accurately. The accuracy of ultrasound measurements used to confirm the calculated due date will be much less accurate further into the can. Measuring the embryo on ultrasound is accurate to within plus or minus five days of the due date. If the crown rump length falls outside of these five days we give you a new estimated due date based on the size of the embryo.

All of the content and articles on our blog and website are intended for informational purposes only. Please do not consider any of the information provided here as a substitute for medical advice. At all times seek medical advice directly with your own doctor and medical team.

What can cause my due date to be wrong?

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