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The short period about a week before a woman's period where an egg is released, also known as a fertile window.

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The union of a single sperm and an ovum.

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A fertilized ovum.

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The zygote becomes a ball of cells within a cavity in the center and begins to burrow into, or implant, the uterine lining.

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Six or seven days after fertilization, the blastocyst attaches itself and becomes embedded in the uterine lining.

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Human chorionic gonadotropin is released in the mothers bloodstream.

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From the time of implantation until about 8th week of development is called the embryo.

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A fluid-filled sac that surrounds the embryo.

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Structure that forms along the lining of the uterus as the embryo implants

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Ropelike structure that connects the embryo and the mother's placenta.

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A developing baby from the end of the eighth week after fertilization until birth is called a fetus.

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14 weeks

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Gender becomes visible by ultrasound

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"Practice" contractions

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37 weeks= Full term

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4 months