Weeks 1-3 The first 3 weeks of pregnancy include the 2 weeks after your period begins and fertiliza...
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Weeks 1-3 The first 3 weeks of pregnancy include the 2 weeks after your period begins and fertilization of the egg. The sperm and egg unite to form a single cell called a zygote. The cell divides to form a cluster of cells that travels down the Fallopian tube to the uterus.

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