A strong positive later turned weak positive should be the test urine HCG began strong positive, three hours later turned weak positive. Urine HCG is to check the presence of HCG in the urine, belongs to the qualitative examination, HCG amount of large will show strong positive, the amount of small will show weak positive, strong positive is early pregnancy or pregnancy-related diseases may be. Three hours to a weak positive may have a miscarriage, and may be related to the pregnancy test paper, but also may be a large amount of liquid into the body within a short period of time, the urine appeared to dilute the state, HCG concentration decreased, urine pregnancy test paper appeared weakly positive, you can use the same brand of test paper to check again. It is best to do ultrasound to check the condition of the uterine adnexa, to determine whether it is an early pregnancy, intrauterine pregnancy, ectopic pregnancy, or miscarriage, all of which can be clearer and more intuitive. It is also necessary to carry out blood HCG examination, which is a quantitative examination and more accurate, and normal pregnancy blood HCG will be doubled every other day, if the blood HCG does not double also support the possibility of miscarriage, combined with ultrasound blood, HCG can be a clear diagnosis, the fluctuation of hormone levels can be caused by irregularities in the endometrial lining, to pay attention to avoiding heavy physical labor.