Aunt refers to menstruation. Menstruation delayed for 3 days to measure a deep and light is not obvious, suggesting that the early pregnancy test paper weak positive, may suggest pregnancy, but does not rule out the case of non-pregnancy. If a woman is sexually active and usually has a regular menstrual cycle, the menstrual cycle is delayed for 3 days, appearing to use the early pregnancy test paper to show a dark and light inconspicuous, may suggest that the woman is pregnant. However, due to the short period of menopause, the concentration of HCG in the urine is not high enough, so there is a deep and light situation that is not obvious when measured with the morning pregnancy test paper. However, if a woman uses the pregnancy test paper in an incorrect way, or the pregnancy test paper is damp or contaminated, there will also be a situation where the test paper reveals one dark and one light, and the woman is mostly not pregnant at this time. If there is a delay in menstruation for 3 days, the early pregnancy test paper measured a dark and light situation is not obvious, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the blood HCG and other tests, in order to clarify whether or not the pregnancy.