The Surrogate Mother (1970)

After years of failed infertility treatments and adoptions that have fallen through, Abby is resigned to the fact that motherhood is not in her future. That is, until her personal assistant Monica makes a generous offer that will make all of Abby’s dreams come true. But it turns out Monica isn’t who she says she is, and the woman now carrying Abby’s child has an unspeakable secret.