1.The endometrium changes throughout the menstrual cycle in response to hormones. During the first part of the cycle, the hormone estrogen is made by the ovaries. Estrogen causes the lining to grow and thicken to prepare the uterus for pregnancy.
2.Ovulation usually happens between days 11 and 21 of your cycle. A hormone called luteinizing hormone (LH) surges, triggering the release of the egg that's most ripe. At the same time, your cervical mucus becomes more slippery to help sperm make their way to the egg.
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