Having intercourse on the day of ovulation is the best time for both. The egg can survive for twenty-four hours after it is discharged, and after the sperm is ejaculated into the vagina, it will reach the fallopian tubes after about one and a half to six hours to combine with the egg to form a fertilized egg, so having intercourse on the day of ovulation is the best time. It is recommended to calculate the time of ovulation, the vast majority of women who have regular menstrual periods, the time of ovulation in the next menstrual period fourteen days before, you can have intercourse during this period, the chances of pregnancy will be improved. If you do not get pregnant despite reasonable arrangements for intercourse during the ovulation period, you need to monitor the follicles by ultrasound to find out whether the follicles rupture and are discharged after they have reached their dominant position, and ultrasound will be a more intuitive way of determining the situation of ovulation.