Ovulation is an important part of the menstrual cycle and can be a good indicator of fertility. Knowing the signs of ovulation can help you better understand your body and plan for conception. Common signs of ovulation include changes in cervical mucus, increased libido, light spotting, abdominal cramps, breast tenderness, and increased basal body temperature. The ovulation process is regulated by the hypothalamic–pituitary–gonadal (HPG) axis. When basal body temperature is high, progesterone levels are low, in turn stimulating follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Increased FSH levels stimulate the ovaries to develop multiple follicles that continue to mature and produce estrogen. There are two types of estrogen: estradiol, a hormone produced by most cells in the body as well as some endocrine glands; and estriol, a weak estrogen produced by only one or a.The menstrual cycle is regulated by the hypothalamus and pituitary gland; ovulation, menstruation, and