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The approximate date may be obtained by taking the date when your last period began, adding 7 days, then counting back 3 months and add a whole year. For example, if the first day of your last period was June 25, 2001; add 7 days and you get July 1, 2001; then count back 3 months and you have April 1, 2002: the estimated due date is April 1, 2002
Even though this is a good method to obtain your due date, REMEMBER that these are just ESTIMATED dates. In some cases your doctor can apply more reliable methods, such as: knowing the exact date of ovulation, measuring the size of the uterus by a clinical exam, ultrasound (during the first half of pregnancy, ultrasound can estimate the age of fetus within 7 days).
