Hello,
Welcome to ehealthforum and thanks for writing
Urine tests can take upto 10 days after a missed period date to give accurate results and within 5 days it is possible that the results are not accurate.Urine tests detect the hormonal levels in the urine which are not detectable unless they reach a ceratin level so possibility of that being inaccurate is present.
If you suspect to be pregnant wait for few more days and then get a repeat test done or you can also get a Blood hcg test done which is a confirmatory test for pregnancy determination.
Take care!