The first time I measured a deep and a light the second time there is no more, this situation generally refers to the performance of the use of early morning pregnancy test strips to detect early pregnancy. Early pregnancy test strips to detect early pregnancy, mainly to determine the concentration of HCG in the urine, the test specimen is not suitable or improper operation methods, too short a period of time after coitus may lead to the occurrence of this phenomenon. 1, a large number of drinking water or taking diuretics before the early pregnancy test, resulting in excessive dilution of urine, urine HCG levels are unstable, so that the results of the test before and after the inconsistency of the two performances; 2, the use of early pregnancy test strips test is not strictly in accordance with the instructions to use, the depth of urine immersion is not standard, the observation time after the test is unreasonable, will also cause the test results before and after the two inconsistent performance; 3, if the time after coitus is too short, the concentration of HCG in the urine is relatively low, coupled with the interference of external factors, it is also possible to appear this phenomenon.