preovulaation

Preovulation refers to the phase of the menstrual cycle that occurs after menstruation ends and before ovulation begins. This period is also known as the follicular phase. During the preovulatory phase, the pituitary gland releases follicle-stimulating hormone (FSH), which stimulates the ovaries to develop several follicles. Each follicle contains an immature egg. Typically, one follicle becomes dominant and matures, while the others degenerate. The maturing follicle produces increasing amounts of estrogen. This rise in estrogen signals the uterus to thicken its lining, the endometrium, preparing for a potential pregnancy. The duration of the preovulatory phase can vary significantly among individuals and from cycle to cycle, but it is generally the longest phase of the menstrual cycle. This phase is characterized by a decrease in body temperature from the lower levels seen during menstruation, with a slight upward trend as ovulation approaches. The cervical mucus also undergoes changes, becoming thinner, clearer, and more elastic, which facilitates sperm transport.