I had n STD test n I think lady used a contaminated gauze with other blood after taking my blood. N putting bandaid on me. Am I at risk for hcv/hiv?

Of course no risk. Nobody in the world ever caught HIV or other blood borne infections from this sort of event. No risk even if the gauze was contaminated. And you can be certain it wasn't; there is no way she would have used the same gauze on two patients.