If the follicle is already mature, intramuscular injection of chorionic peptide to promote follicular rupture and ovulation, usually within 24 hours after intramuscular injection of drugs will be ovulated. If the follicle is already mature, it will be ovulated within 24 hours after intramuscular injection of urotensin or oral clomiphene to promote follicular development. Various reasons cause the follicle development can not be timely discharged, usually in the follicle development of timely intramuscular injection of chorionic peptide to promote the follicle rupture discharged, after the use of normal 24 hours will ovulate, but need to grasp the timing of the use of medication under the guidance of the doctor. If you use urotensin or clomiphene to promote follicular development, you want to determine the time of ovulation, you need to vaginal ultrasound intermittent monitoring of follicular development to determine the time of follicular development and maturation of discharged, so as to guide the coitus will help to get pregnant. Note that the application of ovulation drugs need to go to the hospital obstetrics and gynecology department regular use of drugs, to avoid random use of drugs lead to follicle development too fast or too slow, thus leading to discomfort; the application of drugs during the discomfort, consult a doctor in a timely manner, to determine the cause of timely measures.