Thrush can not be brushed off, that would be plaque. Thrush if rubbed on roughly will pop open and bleed but not rub off also thrush does not mean you definitely have hiv, thrush can occur without having HIV. Babies get it and so do adults without having it. It is caused by yeast, excess yeast in the mouth, if you have oral on someone who has a yeast infection it can cause it to be in the mouth. Well good luck on the test results and like I said it probably was just plaque!