Understanding Your Menstrual Cycle is critical to charting fertility and predicting ovulation. Read about your menstrual cycle - what happens pre and post ovulation - as well as what happens during ovulation.\nThe Luteal Phase\nThe Luteal Phase is the time period beginning with the day after ovulation and running through the remainder of your menstrual cycle (it ends the day before your next period). Typically, the duration of the luteal phase phase lasts between 10 and 16 days - and is generally consistent from cycle to cycle, averaging for most women at 14 days.\nIn the Trying to Conceive (TTC) Community, the luteal phase is also referred to as "DPO" - or days past ovulation. At the onset of the luteal phase, women's body temperature increases (Basal Body Temperature) in order to provide a fertile environment for the ovum - and the uterus undergoes physiological changes that support implantation and fetal development.\n\nThe Luteal Phase in the Menstrual Cycle\nAt the beginning of the menstrual cycle, the body begins to produce follicle stimulating hormone (FSH). FSH facilitates the formation of a follicle on one of the ovaries. The follicle contains and nurtures the egg. When a follicle has adequately matured, a surge of luteinizing hormone (LH) causes the follicle to burst and release the egg into the fallopian tube - ovulation. At this point, fertilization of the egg may take place.\nOnce the follicle expels the egg, the follicle is called a 'corpus luteum'. The corpus luteum is responsible for producing the hormone progesterone - and during the luteal phase, progesterone facilitates a thickening of the uterine lining and the development of blood vessels, which gives the embryo a place to attach. During the luteal phase, the corpus luteum will produce progesterone for approximately twelve days.\nReturn to: Understanding Your Menstrual Cycle\nRead More About:\nThe Dynamics of Conception and Fertility:What Happens During Ovulation?