Nine days after the day of ovulation there is a possibility of implantation. On the day of ovulation when the egg is discharged, the sperm and egg combination to complete fertilization occurs within 24 hours after ovulation, after which the fertilized egg in the fallopian tube with the peristalsis of the epithelial cilia to the uterine cavity, 4 days after fertilization to enter the uterine cavity, 6 to 7 days after fertilization to complete the process of implantation, at this time, from the day of ovulation is generally 7-8 days, so it is possible to implantation of the day of ovulation 9 days after the day of implantation. When the fertilized egg starts to differentiate and develop, the trophoblast cells can secrete specific human chorionic gonadotropin, and at this time, it is possible to determine whether or not there is a pregnancy as early as possible through the measurement of the level of human chorionic gonadotropin in the urine or blood. If the patient wants to know whether the pregnancy has occurred after ovulation, the patient can consult a doctor for examination under the guidance of a specialized physician.