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Cell fusion has begun, and the sperm and egg's nuclei shed their protective
membranes as they meet - merging within twelve hours. The mother's 23
chromosomes and the father's 23 chromosomes attach, creating a blueprint for
further cell creation. Cells have begun to split and finally form the
morula, which glides along the fallopian tube toward the uterus by the second
day. By the fourth day, the morula enters the uterus. It's shape
changes to a single layered hollow sphere, filled with fluid. On one side,
a group of cells gathers together, forming what will be your baby. The
rest of the morula becomes the protective membranes that will connect to the
uterus.