you had unprotected sexual intercourse and has taken emergency contraceptive pill
now you have delayed periods and upt is negative..
you need to take this test with early morning urine sample after 4-5 days of missed periods..
is confirmatory in diagnosis of pregnancy
and UTI is common in females, but it should be investigated and treated..
see your physician for the investigation for uti, urine examination and treatment with antibiotics and urine alkanisers....
drink lot of water, and maintain good genital hygeine..
all the best..