How can I convert a “Implicitregion” to a “set”?

I want to RegionPlot the “complement” of two regions (r1 and r2), but I don’t know how to convert the ImplicitRegion to the “set”. I know there is something wrong with r3, can anyone help me with it? thanks!

r1=ImplicitRegion[y-x^2>0,{{x, 0, 1}, {y, 0, 1}}];  r2=ImplicitRegion[0<x<1 && 0<y<1,{{x, 0, 1}, {y, 0, 1}}];  r3=Complement[r1,r2]  RegionPlot[{r3}, FrameLabel -> {x, y}]