Follicles that have not grown in three days may be related to insufficient ovulation stimulating hormones in the body. The hormones that affect the development and maturation of follicles are estrogen, follicle-stimulating hormone and luteinizing hormone. If there is endocrine disorders, resulting in insufficient hormone secretion will affect the normal development of follicles, resulting in slow follicular development or non-development, and not normal ovulation and other effects on normal fertilization. It is recommended to go to the hospital to check the six items of female hormones, according to the results of the examination to regulate the endocrine system, can also be used under the guidance of the doctor to promote ovulation injection treatment. Under normal circumstances, from the end of menstruation in the body estrogen began to rise, the follicle began to develop, after about 8-9 days close to ovulation, follicle development to a diameter of 1.8-2.5cm is a mature follicle ovulation, the egg is discharged after the survival of three days or so, if the fertilization will be developed into a fetus, or else it will be dead.