When women have sex during ovulation, urine pregnancy test paper has been weakly positive, the reasons are as follows: 1, may be a woman pregnant for a shorter period of time, the body of the chorionic gonadotropin level is low, you can after a week again to retest or blood test chorionic gonadotropin level is elevated, the most certain whether the woman is pregnant; 2, if a woman is pregnant with biochemical pregnancy, the body of the chorionic gonadotropin level is elevated less; 3, may be a woman testing method error or failure to cause false results; 3, the method of testing error or failure to cause false results. If a woman is pregnant and has a biochemical pregnancy, the chorionic gonadotropin level in her body is less elevated, and the urine pregnancy test will be weakly positive; 3, it may be that the woman’s test method is wrong or invalid to cause the wrong results. When women with urine test paper test appeared weak positive, need to go to the hospital in time to blood test chorionic gonadotropin levels and gynecological ultrasound, diagnosis of whether the woman is pregnant.