None of us can tell you.
The test said negative if your still convinced you are do another test or see a doc
With my first pregnancy I didn't get a positive test until I was in my 3rd trimester. Your body might not be producing enough hormones to pick it up on a at home test. It might be better to go get blood work just in case.
Its possible your urine will not show positive but a blood test will. Either way make an appointment with your dr. They will help figure out a late period whether its pregnancy or another health problem.