Normally a follicle of 1.5cmx1.2cm may ovulate in 3 days, depending on the individual. When the follicle develops to 1.8cmx2.5cm as a mature follicle, capable of ovulation, and the follicle growth rate of about 0.15cm per day, so under normal circumstances follicle development to 1.5cmx1.2cm, due to the follicle is not yet mature, does not have the ability to fertilization, but also need to continue to develop for about 3 days before ovulation. When the follicle is smaller than 1.7cm, it is called an immature follicle. If the woman’s health is poor and she ovulates early, she may not be able to get pregnant during this period. Women with fertility needs can go to the hospital for an ultrasound to monitor the size of the follicles, or use ovulation test strips to see if the follicles have been discharged. If a woman is experiencing discomfort, it is recommended that she go to a specialized hospital to determine the cause of the problem and then undergo further examination and treatment under the guidance of a doctor.