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Hegar's sign is a non-sensitive indication of pregnancy in women—its absence does not exclude pregnancy. It pertains to the features of the cervix and the uterine isthmus . It is demonstrated as a softening in the consistency of the uterus, and the uterus and cervix seem to be two separate regions.
Due date estimation basically follows two steps: Determination of which time point is to be used as the origin for gestational age.This starting point is the woman's last normal menstrual period (LMP) or the corresponding time as estimated by a more accurate method if available.