I suggest you take a pregnancy using your blood, go to your doctor and try that way because you should be getting a positive result if your 5 weeks already, I tested a week after my missed period and it was positive
If your tests are negative at 5 weeks from your last period then there is no hcg in ur urine and you are not pregnant tests these days pick up even a small amount of hcg by 4 weeks if not even before that