Urine pregnancy is usually accurate upto the point of 99.5%.So a 3 results of urine pregnancy coming negative is almost sure that she is not pregnant. And a 15 day delayed period would not be because of a pregnancy, it can be many other reasons and it has to be found out. Why would a false report come? It comes because you have done a urine pregnancy early. So you have to wait for a missed period to do a urine pregnancy test. Second thing is, if it is dark yellow coloured urine, here it says it is not a dilute urine, it is a concentrated urine, and done at odd hours. So if you have done 3 early m morning samples and all 3 are negative, unlikely to be a pregnancy test, Rule out other causes of delayed periods and treat appropriately. If you have a little doubt, best is to do a blood test of beta HCG. If that is negative, it is 100% negative

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