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“If the date of your last period is several days off from our calculations, we give validity to the ultrasound,” she says.In general, this doesn’t happen a lot—but it usually depends on how your due date is calculated in the first place.Counting back 3 calendar months would be June 9, 2010.Adding 1 year and 7 days would bring you to June 16, 2011, as your estimated due date.“Outcomes are improved for both moms and babies when due dates are accurate,” Lamppa says.You can work out the date your baby is likely to be born by counting from the first day of your last period. That’s nine calendar months and seven days, or 40 weeks.Here you will be given a scan and receive an accurate date for your baby's birth.But if you're impatient to know when your baby will arrive, then our calculator tool gives you an estimate due date without the wait.
But during the next visit, she changed it again—to March 6.
My ob-gyn at the time liked to do an ultrasound during every visit.
After my second scan, she changed the due date to March 4.
A typical pregnancy lasts, on average, 280 days, or 40 weeks—starting with the first day of the last normal menstrual period as day 1.
An estimated due date can be calculated by following steps 1 through 3: For example: Your last menstrual period began on September 9, 2010.