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The Four Phases of the Menstrual Cycle

The Period Party

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How LH Surges Before Ovulation

LH and progesterone increase levels of substances known as prostaglandins. These are responsible for weakening the walls of the follicle so the egg can more easily get out. Once an egg is released, it only is going to survive for about 12 to 24 hours. If both were to be fertilized, this would result in fraternal twins.

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