If menstruation is delayed for 3 days, you can use the pregnancy test stick to detect, most of them can be detected, but because of the low concentration of HCG secreted by the body at this time, the detection may be manifested in a weakly positive, you can use the morning urine to test the next day, in addition to delayed conception of the person may not be detected, at this time it is necessary to take a blood test to check the blood HCG, when the blood HCG>10mIU/mL, it is When the blood HCG>10mIU/mL, it indicates pregnancy. If you use a pregnancy test, it’s best to use morning urine because the concentration of HCG in morning urine is higher, so the chances of a positive test are also higher. And don’t drink too much water two hours before taking the urine specimen because it will cause the urine to dilute, which may result in a false-negative result.