Uneven, splotchy teeth color after Zoom whitening

I had Zoom whitening done at my dentist's office two days ago, and my teeth immediately were splotchy. The tech told me that this would go away in a few days, but I see no difference so far. Would more Zoom/whitening help, or is there a different method to even out the color? I was not given at-home trays, as the dentist was hoping to put veneers on two of my teeth and didn't want to fit the trays prior to putting on the veneers.