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Days 1 through 5
During Days 1 through 5 of your cycle, fluid-filled pockets called follicles develop on the ovaries. Each follicle contains an egg.
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Days 5 through 8
Between Days 5 and 7, just one follicle continues growing while the others stop growing and are absorbed back into the ovary. Levels of the hormone estrogen from the ovaries continue rising. By Day 8 the follicle puts out increasing levels of estrogen and grows larger. Usually by Day 8, period bleeding has stopped. Higher estrogen levels from the follicle make the lining of the uterus grow and thicken. The uterine lining is rich in blood and nutrients and will help nourish the embryo if a pregnancy happens. Estrogen helps boost endorphins, which are the “feel good” brain chemicals that are also released during physical activity. You may have more energy and feel relaxed or calm.
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Day 14
A few days before Day 14, your estrogen levels peak and cause a sharp rise in the level of luteinizing hormone (LH). LH causes the mature follicle to burst and release an egg from the ovary, called ovulation, on Day 14. A woman is most likely to get pregnant if she has sex on the day of ovulation or during the three days before ovulation (since the sperm are already in place and ready to fertilize the egg once it is released). A man’s sperm can live for three to five days in a woman’s reproductive organs, and a woman’s egg lives for 12 to 24 hours. In the few days before ovulation, your estrogen levels are at their highest. You may feel best around this time, emotionally and physically.
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Days 15 through 24
Over the next week (Days 15 to 24), the fallopian tubes help the newly released egg travel away from the ovary toward the uterus. The ruptured follicle on the ovary makes more of the hormone progesterone, which also helps the uterine lining thicken
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