![]() ![]() Most women do not know the exact date of conception because it can be challenging to know exactly when ovulation occurs. Calculating Conception Date In a Typical Pregnancyįor a woman with a regular period, conception typically occurs about 11-21 days after the first day of the last period. The most accurate way to determine gestational age is using the first day of the woman’s last menstrual period and confirming this gestational age with the measurement from an ultrasound exam. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy. It becomes less accurate later in pregnancy. Measuring the baby using ultrasound is most accurate in early pregnancy. The baby can be measured as early as 5 or 6 weeks after the mother’s last menstrual period. A pregnancy wheel is often used to calculate gestational age. Gestational age is calculated from the first day of the mother’s last menstrual period and not from the date of conception. If the mother has a regular period and knows the first day of her last menstrual period, gestational age can be calculated from this date. Calculating Gestational Age Last Menstrual Period Use our Pregnancy Calculator to calculate these dates for you. “When exactly did I get pregnant” is a difficult question to answer precisely because calculating conception is done by using the first day of your last menstrual period or an ultrasound date.
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