Women with test paper test appear white bar, consider the test method is not right, urine contamination test paper caused by the consideration of urine in the LH hormone or HCG is too low, can not lead to the test paper to appear obvious color, there will be a white bar. For women who use wet paper with a white bar, can not determine whether it is a weak positive or positive, considered to be a negative manifestation of the urine contamination caused by the test paper with a white bar, you need to re-test the test paper to determine to see the specific situation. The use of ovulation test paper to monitor ovulation, you need to use ovulation test paper again in the urine to test, to see whether it is a negative state, or weak positive or positive state. Women whose menstrual cycle is delayed can retest with a pregnancy test or ovulation test to see if it is weakly positive or negative.