Question?! 3 weeks late and still a bfn

Emily
I took a test Sunday morning and it was positive and then went to the dr hrs later because of an ear infection and sinus drainage (oh hey winter!) and I decided to have to dr do a test there too. She said they couldn't do the blood test bc they didn't have a lab but they did a urine test and it was negative. How long should I wait to re-test??