Merck Manual

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From Fertilization to Implantation
From Egg to Embryo
From Fertilization to Implantation

Once a month, an egg is released from your ovary into your fallopian tube. After sex, sperm move from the vagina to the fallopian tubes, where a sperm may fertilize the egg. The cells of the fertilized egg keep dividing as the egg moves to the uterus, where it implants in the wall.