"You are flying at Va and pull back on the controls in an full abrupt manner, what is the first thing that will happen?"
The OP states flying "at" VA, therefore in theory the aircraft should still stall within the 3g limit because he is not exceeding VA, it is hypothetical, but only answering the OP question in the literal sense, if some numpty is daft enough to put it to a test from 12000' then good luck to them.
There is a % safety buffer built in, for the same reason why flying 1 kt over VNE the aircraft does not immediately disintegrate.