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Phase two, known as the follicular phase, is when the hormone estrogen causes the lining of the uterus to grow or proliferate. The lining inside the uterus is called endometrium and starts to develop to receive a fertilized egg should a female become pregnant.

The menstrual phase is the monthly cycling of the woman’s body inside her uterus. Day one of the menstrual phase is considered the first day of your period when the menstrual blood (menses) is shed from the lining of a woman’s uterus through the vagina. At this time the menstrual blood is being shed from the lining of the uterus if there is no implantation of sperm to produce child birth.