The accuracy of estimating your date of conception depends on several factors about your menstrual cycle and ovulation, as well as facts about the egg and the sperm. Thanks MG. Also Read: Between 18 and 28 weeks of gestation, the margin of error increases to plus or minus two weeks. Page 1 of 1 11 items. The doctor may change the due date based on the result of the first ultrasound measurement which is fairly reliable. You can then use a pregnancy calculator, such as the one on perinatology.
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The calculation of the date of conception is just an estimated date.
How Accurate Are Conception Dates?
The various methods are accurate to within one to five days. But babies rarely appear on their due date anyway. Ultrasound due date is different from LMPand the ultrasound assessment is correct and accurate for most cases. The most accurate time is between 8 and 11 weeks gestation. FWIW I have strange cycles so hard to know conception date but for my last pregnancy, the date they gave me at the 12 week scan was the day on which LO arrived, so I am going by that date again this time!! However, you could have conceived on day 12 or 13 if ovulation was earlier, or days 15 or 16 if later.