A woman’s follicles can be oval or round and resemble a small blister in which an egg is produced. The follicles are not visible to the naked eye and can be examined by ultrasound. When a woman is ovulating, the size and shape of the follicle can be visualized by ultrasound. A follicle with a diameter of more than 15 mm is considered a growing follicle, and a mature follicle is considered a mature follicle if it is more than 18 mm in diameter. If the follicle is closer to round, the quality of the follicle is better, and the probability of forming a mature and dominant egg is higher. If you are preparing for pregnancy, you can visualize the follicle development through ultrasound, and arrange for sex after the follicle has been normally discharged, and the probability of getting pregnant is higher.