From the biological point of view, the life of every human being begins with a single cell, called a zygote, which arises from the union of an egg cell from his mother and a sperm cell from his father. When a zygote forms, a conception is said to have occurred and a pregnancy begins. Even among couples who engage in sexual intercourse regularly, a conception in any particular month is far from certain. To take these uncertainties into account, it seems necessary to introduce probabilistic concepts. The term, fecundability, has come into wide usage in discussions of stochastic models of conception and birth as an expression of the uncertainties surrounding conception. A tentative definition of fecundability is the probability a married woman conceives in a given month.
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