The deep and light test paper may be caused by the low concentration of HCG (human chorionic gonadotropin) in the urine at the beginning of pregnancy, and the test paper may deepen after 2~3 days. The test paper is dark and light, indicating a weak positive, if this situation, indicating that the possibility of pregnancy is relatively large, just due to the short duration of pregnancy, the human chorionic gonadotropin in the urine is still relatively low caused by, in general, in 2 ~ 3 days after the test paper again, the line may deepen in color. It should be noted that, even if the use of early pregnancy test paper measured positive, there is still a certain probability of false pregnancy, women who use early pregnancy test paper measured positive or found their menstrual period delayed for at least one week, it is best to go to the hospital in a timely manner, under the guidance of the doctor to improve the blood HCG and uterine adnexal ultrasound examination, so as to further check to determine whether the normal pregnancy.