![]() This is also soon after she notices pubic and underarm hair. Stress, strenuous exercise, and diet can affect when a girl first has her period. has her first menstrual period at about age 12. This is generally 2 to 3 years after her breasts start to grow. If fertilization does not occur, the endometrium, along with blood and mucus from the vagina and cervix make up the menstrual flow that leaves the body through the vagina during the period. Increased levels of estrogen and progesterone help thicken its walls. With each monthly cycle, the endometrium prepares itself to nourish a fetus. This occurs throughout a woman's reproductive life. Menstruation is one part of a woman's cycle when the lining of the uterus (endometrium) is shed. ![]() At this time, some women have minor discomfort in their lower abdomen, spotting, or bleeding, while others do not have any symptoms at all.Ī woman is generally most likely to get pregnant (fertile) if she has sex a few days before, and during ovulation. The cycle starts with the first day of one period and ends with the first day of the next period. The average menstrual cycle lasts 28 days. ![]() If the egg does not become fertilized, the lining of the uterus (endometrium) is shed during menstruation. The placenta transfers nutrition and oxygen to the fetus from mother. The fertilized egg attaches to the lining of the uterus. If the egg is fertilized by a sperm as it travels down the fallopian tube, then pregnancy occurs. The ovaries are the two female reproductive organs found in the pelvis. This is when a mature egg or ovum is released from one of the ovaries. When a young woman reaches puberty, she starts to ovulate. Click Image to Enlarge What is ovulation?
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