Dating a pregnant woman
[See Photos of the Burial and Skeletal Remains in Timna Valley] At the time the pregnant woman lived, Egypt controlled the mines at Timna, suggesting she was Egyptian.
Sometimes, timing may also use the fertilization age which is the age of the embryo.
A woman who has never been pregnant is referred to as a nulligravida.
A woman who is (or has been only) pregnant for the first time is referred to as a primigravida, Therefore, during a second pregnancy a woman would be described as gravida 2, para 1 and upon live delivery as gravida 2, para 2.
Alternatively there are mobile apps, which essentially always give consistent estimations compared to each other and correct for leap year, while pregnancy wheels made of paper can differ from each other by 7 days and generally do not correct for leap year.
Furthermore, actual childbirth has only a certain probability of occurring within the limits of the estimated due date.