The term best time to have sex during pregnancy is not exact, but generally the chances of conception increase when a woman has sex during ovulation. If a woman has regular periods, she will ovulate about 14 days before her next period, and the first five to four days of ovulation are the ovulation period. If menstruation is irregular, ovulation can be detected by ovulation test paper or by ultrasound monitoring of the follicles at the doctor’s office. The ovulation period is the few days after the dominant follicle is detected and until the dominant follicle disappears. Some women experience increased vaginal discharge and lower abdominal cramps during ovulation. A woman will only discharge one or two mature eggs during ovulation every month. The eggs will survive in the body for two to three days, and the woman can only get pregnant when the sperm meets the egg in the body and combines to form a fertilized egg after having sex. Therefore, having sex during ovulation can increase the chances of conception. However, having sex frequently will reduce the quality of sperm. To ensure the quality of sperm, you can choose to have sex on alternate days of ovulation. Pregnancy can be detected by blood human chorionic gonadotropin test after 10 days of sexual intercourse, or by urine pregnancy test after 2-3 weeks of sexual intercourse.