While the due date can be estimated, the actual length of pregnancy depends on various factors, including age, length of previous pregnancies, and weight of the mother at birth. Alternatively, the due date can also be estimated based on a person's last menstrual period. During a person's first OB-GYN visit, the doctor will usually provide an estimated date (based on a sonogram) at which the child will be born, or due date. The World Health Organization defines a normal pregnancy term to last between 37 and 42 weeks. Childbirth usually occurs approximately 38 weeks after conception, or about 40 weeks after the last menstrual period. Pregnancy is a term used to describe a woman's state over a time period (~9 months) during which one or more offspring develops inside of a woman. Related Ovulation Calculator | Conception Calculator
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