Generally, when a woman reaches puberty, her ovaries develop and mature, and cyclic ovulation occurs. Normally only one follicle develops and matures during each menstrual cycle, and each follicle contains one egg. After ovulation, the egg has the ability to be fertilized within 24 hours, with the strongest ability to be fertilized in 15-18 hours. And sperm have the ability to penetrate the egg’s zona pellucida within 48 hours in the female reproductive tract. Therefore, there is a chance of getting a pregnancy only if you have intercourse around the time of ovulation. However, some women, for various reasons, may have impaired follicular growth or impaired rupture. In such cases, the chances of pregnancy are greatly reduced. Most ovulation disorders are characterized by disturbed menstrual cycles, but some women with normal periods may also have ovulation disorders. Under normal circumstances, most women can detect some special signs before and after ovulation, such as: 1, with the increase in estrogen levels, the cervical mucus will become transparent and appear pulling, similar to egg whites; some women also have breast tenderness. 2, when the follicle ruptures, some women will have breast tenderness. 2, in the follicle rupture some people will feel obvious lower abdominal pain, or a small amount of ovulation bleeding. 3, due to the rise in progesterone after ovulation, it will lead to an increase in basal body temperature, about 0.5 ℃. 4, using ovulation test paper to test urine, can also show the presence or absence of elevated luteinizing hormone. All of these can help a woman determine whether she is ovulating or not. However, all of these symptoms only reflect that there may be elevated levels of hormones in the body and are only an indirect reflection of ovulation. These signs are especially atypical in patients with ovulation disorders. Therefore, the most accurate way to monitor ovulation is continuous ultrasound monitoring coupled with hormone measurement. Generally, the number of monitoring sessions per menstrual cycle is determined by the rate of follicular growth and is around 3-6 sessions.