Amy doesn't know it yet, but she is pregnant. She conceived one week ago and has not yet missed a menstrual period. Amy's developing child is in the period of the

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Amy's developing child is in the period of the zygote, which is the initial stage of prenatal development that begins at fertilization and lasts for about two weeks. During this period, the zygote undergoes rapid cell division and forms the blastocyst, which eventually implants in the uterus wall and forms the placenta and embryonic membranes. At this early stage, the developing zygote is not yet considered an embryo or fetus.

Amy Doesn't Know It Yet, but She Is Pregnant