The white board here refers to a negative urine pregnancy test. A negative urine pregnancy test with four days left for menstruation may be due to invalid test, too early test, etc. Depending on the reason, you can take a new test or delay the test to solve the problem. 1. Invalid test: The test method may be incorrect, resulting in a negative early pregnancy test, you can take the test again. Generally speaking, it takes about 2 weeks after intercourse for early pregnancy to be detected. It is recommended to take the test with morning urine, taking the middle part of the urine, which can increase the sensitivity. If the test result shows one bar, it is negative. If there are two bars, it means it is positive and you are pregnant, and you will not get your period if you are pregnant. 2. test time is too early: if the time between intercourse and the test is relatively short, the early pregnancy test paper can not be detected, you can test again in a few days, or go to the hospital through the blood test can also be diagnosed whether the pregnancy. There are four days to menstruation early pregnancy test paper results negative, there may be other situations, you can go to the hospital to improve the relevant examination to clarify the cause and take appropriate measures.