Eggs are mostly follicles. Whether a follicle is round or oval is a normal pattern, and there is no difference between good and bad. In clinical different menstrual cycle, the size of the follicle is different, so sometimes the follicle shows round or oval shape, usually in the 3rd~5th day of the menstrual cycle, you can find the existence of small follicles in the ovary, gradually growing follicle development and maturity, the mature follicle may be round or oval, the dominant follicle size of 1.8~2.2cm. The follicle size is 1.8~2.2cm. The follicle maturity can be monitored by ultrasound to determine the general time of ovulation, and intercourse during the ovulation period can increase the chances of conception. However, for those who do not want to have children, they need to take effective contraceptive measures during the ovulation period to reduce the chance of pregnancy.