Using a pregnancy test is generally more accurate in the morning than at night, because when you get up in the morning without eating on an empty stomach, the value of chorionic gonadotropin in the urine can be higher and more easily detected by the pregnancy test. If the urine is diluted and the concentration decreases after drinking or eating, the use of early pregnancy test strips is generally recommended to use morning urine for the test, which is only limited to the early stage of pregnancy. If you have been pregnant for some time, for example, your period has been overdue for more than five days, no matter when you use urine to do the test, the pregnancy test stick can show two obvious red lines and there will be no false negatives. You can also see your doctor for a blood chorionic gonadotropin test ten days after you have had sex to know earlier if you are pregnant.