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The ruptured follicle (corpus luteum) now secretes progesterone and estrogen to continue to prepare the uterus for pregnancy. If the egg is not fertilized, estrogen and progesterone levels drop and, on Day 28, the menses begin.

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The follicle produces more estrogen to prepare the uterus for pregnancy. At ovulation, usually around Day 12 – 14, increased estrogen levels trigger a sharp rise in Luteinizing Hormone (LH) from the pituitary gland, causing release of the egg from the follicle.

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On Day 1 of the menstrual cycle, estrogen and progesterone levels are low. Low levels of estrogen and progesterone signal the pituitary gland to produce Follicle Stimulating Hormone (FSH). FSH begins the process of maturing a follicle (fluid-filled sac in the ovary containing an egg).

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LH levels (top image)
Progesterone Levels (bottom image)

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The luteal phase is the second half of your menstrual cycle. It starts after ovulation and ends with the first day of your period.

Once the follicle has released its egg, the egg travels down the fallopian tube, where it may come in contact with sperm and be fertilized. The follicle itself then changes. The empty sac closes off, turns yellow, and transforms into a new structure called the corpus luteum.
The corpus luteum releases progesterone and some estrogen. Progesterone thickens the lining of your uterus so that a fertilized egg can implant. Blood vessels grow inside the lining. These vessels will supply oxygen and nutrients to the developing embryo.

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The Ovulatory Phase occurs in the middle of your cycle, at around day 14. For couples interested in conceiving, intercourse should ideally occur two to three times per week soon after the cycle begins to ensure that intercourse falls within the fertile window, which is approximately one to two days prior to ovulation.

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The follicular phase, also known as the preovulatory phase or proliferative phase, is the phase of the estrous cycle in the  menstrual cycle. During this, follicles in the ovary mature from primary follicle to a fully mature graafian follicle. It ends with ovulation. The main hormones controlling this stage are secretion of gonadotropin-releasing hormone which are follicle-stimulating hormone and luteinising hormone. They are released by pulsatile secretion

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Uterine lining through-out the menstrual cycle

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Uterine lining through-out the menstrual cycle