Accuracy of POAS at 9 DPO

I've always waited until I missed my period, and prob will this cycle too. However, my period is due in 5days. I have some dollar store cheap tests, and also have first response tests that "claim" to know 6 days before your missed period. I assume the closer you are to your expected af date, the more effective the test will be. But.JW .. how many DPO have you gone and gotten a accurate positive on an hpt? What brand/kind of test did you use? Anyone get a positive at 9,10,11 DPO?