Morning urine is not always necessary for early pregnancy test paper detection, as follows: 1. Not necessarily: If the pregnancy is long, at this time the fetus is larger and secretes more human chorionic gonadotropin, in this case either the morning urine or the usual daytime urine can check whether it is pregnant. 2. Need to use: If the fertilized egg has been in the uterus for a relatively short time, less than 14 days. At this time, because the fetus is too small and secretes less hormones, it may not be checked with the usual urine, but with the morning urine it may be accurate and not easy to have a false negative. If the test is weakly positive at the beginning, you can check again after 1-2 days, if you are pregnant, the positivity will become clearer as time goes on.