If you have always had regular cycles, the possibility is that the urine pregnancy
test was not properly done; may need to be repeated with a fresh early morning sample of urine and a result is usually seen 3-7 days after a missed period. Else, you can get the blood test
done as it is more specific and sensitive. Condom alone has a higher failure rate than using double protection. You can also get a trans-vaginal sonogram to clarify the situation and see a specialist for further management. Hope this helps.