Pregnant early pregnancy test paper can not be detected may be the pregnancy time is too short, early pregnancy test paper quality is not good and other factors. 1. pregnancy time is too short: after pregnancy, pregnancy time is too short, HCG value is relatively low, in the use of test paper test, it will not be detected, but in the hospital for blood and urine HCG examination, can determine pregnancy. 2. Poor quality of early pregnancy test strips: Poor quality of the early pregnancy test strips purchased or incorrect method of testing may lead to abnormal test results. You should buy good quality pregnancy test strips and take the test several times, not just once. If you are pregnant and can’t find out from the pregnancy test, it is recommended that you seek medical attention for blood and urine HCG tests to determine whether you are pregnant, and after you are sure that you are pregnant, you should take good care of your pregnancy.