Calculate how?
Typically, a pregnancy lasts about 38-42 weeks. That is why the period of 40 weeks or 280 days are considered "standard". It is interesting that, although we all think pregnancy lasts for 9 months, then calculated, it lasted nearly 10 months of the calendar. That's because we start counting from the time pregnancy weeks LMP, rather than two weeks later, when conception is most likely happened.
Since generally refers to the estimated time Estimated date of birth is confinement (EDC) or Estimated date of Delivery (EDD) - translated as the expected time of birth.
another way to expected date of birth of the baby is taking the first day of your last period minus 3 months, then add seven days to. For example, if the mother's last menstrual period began on 1/12, subtract 3 months plus 7 days ago before the due date will be 8/9. This is a way to calculate the 40 weeks of pregnancy.
But how do I know if I become pregnant when?
Sometimes it can calculate the time of conception, if the husband and wife relationship occurs infrequently. For some families, such as soldiers, miners, usually spouses live apart, the couple living discrete place. So if you remember the exact time of the relationship, you can estimate the time of conception is quite correct.
But you remember, the calculation of birth date is still just a "conjecture" and not complete is accurate throughout.
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