Pregnancy Stages Videos
Labor will also vary from pregnancy to pregnancy in the same woman. During labor, the opening of the uterus opens (dilates) as a result of rhythmic tightening and relaxation of the uterine muscles.
After an egg is released from an ovary and is fertilized, it travels slowly through the fallopian tube to the uterus. During this time it begins to divide until it has grown to about 100 cells.
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