Just wait for the plumber and he will let you know. It could be something as easy as TP preventing the float ball from actuating the switch. Don't flush any more unless you want a possible flood. You could try shaking the PVC but if the pump turns on then you won't know what the problem was and it may happen again when your not there ending in a sewage flood. The tanks are supposed to be water tight but that is not always the case.
I would wait and let the plumber look and test it.