The time to detect pregnancy results depends on the method of testing, which in principle can be detected 7-10 days after sexual intercourse. Early pregnancy testing usually involves testing the HCG value, or human chorionic gonadotropin. HCG can be released about 7-10 days after the union of sperm and egg, and can be detected in the urine of pregnant women, but the concentration is low at this time, so it is not easy to detect using early pregnancy test strips. A blood chorionic gonadotropin test can be performed, and if the value is greater than 25 mIU/mL, pregnancy is considered. If the period is delayed for more than 3 days, an early pregnancy test can be performed, and HCG can be detected at this time. However, for more precise detection of pregnancy or to see if the pregnancy is normal, an ultrasound can be performed about 10 days after the delay in menstruation and the pregnancy can be confirmed by seeing the gestational sac in the uterine cavity. Since women with early pregnancy usually experience nausea, fatigue and other early pregnancy reactions, women who have normal sex life should consider pregnancy if they experience early pregnancy reactions and delayed periods, and go to the obstetrics department promptly if necessary.