In the clinic, most of the follicles are not absolutely round, oval more, in the clinic as long as the pressure in the follicle is large enough, the body hormone level is balanced, in the clinic does not affect the conception. It is recommended that when the ultrasound monitoring follicle diameter reaches 18mm, it is the dominant follicle, you can choose to cohabit, the vast majority of follicles will rupture when the diameter reaches 20mm, discharging the egg. If you choose to have intercourse in the case of a dominant follicle, the chances of getting pregnant clinically increase. If it is a follicle, in the case of clinical pressure is not big may, even if the dominant case will not be ovulated, clinically known as follicular luteinization, it is recommended to do further examination, clinical then give treatment.