In cases where ovulation is confirmed, a pregnancy test can detect pregnancy as early as about 14 days after intercourse. If you are not sure when you ovulate, because sperm can survive for 72 hours and ovulation is possible at any time within these 72 hours, you need to delay the urine test for another 3 days to ensure the accuracy of the test results. The concentration of HCG in the morning urine is relatively high after a night of concentration, so it is easier to detect a positive result. However, the accuracy rate of urine test for pregnancy is not 100%. If the patient’s test result is negative, but the patient’s menstruation is delayed and does not come, along with early pregnancy reactions such as breast swelling, nausea, vomiting, etc., blood test is needed for confirmation.