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Before the egg is fertilized, it comes out of an ovary.

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The union of a single sperm and an ovum.

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A fertilized ovum.

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A ball of cells which forms early in a pregnancy.

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The blastocyst burrows into the uterine wall.

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Hormone levels detected by pregnancy tests.

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Time of implantation until the eighth week of development.

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A 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 fluid-like sac that surrounds the embryo.

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An offspring of a human in the stages of prenatal development.

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Begins around week 13 and ends around week 27. Gender is visible, during this trimester.

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Begins at week 28 and ends at week 40.

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Begins at 39 weeks and ends at 40 weeks.

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Practice contractions.

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Contractions occur, and water breaks.

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Head crowning occurs, and you can either deliver through your vagina or a c-section.

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Placenta is delivered.