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  Periods and Fertility in the Menstrual Cycle Introduction Understanding periods and fertility in the menstrual cycle is an essential part of reproductive health. For many women and teens, learning how the body works helps reduce anxiety, improve self-care, and prevent misunderstandings about pregnancy. The menstrual cycle is not just about monthly bleeding—it’s a complete biological process that prepares the female body for pregnancy. Knowing the connection between periods and fertility in the menstrual cycle can help you better plan for pregnancy, avoid it, or simply understand your health. What Are Periods? Periods are the monthly shedding of the uterus lining (endometrium) when no pregnancy occurs. They usually last 3–7 days and occur every 21–35 days. They mark the beginning of the menstrual cycle . The average blood loss is around 2–6 tablespoons per cycle. Cramps, mood swings, bloating, and fatigue are common. In simple words, periods are your body’s ...