Simple and Stilton
Most tower controllers would not cancel take off unless there was an extremely urgent reason - such as a runway incursion. Even if something is seen wrong with the aircraft the crew are very likely to already know and calls from ATC are unlikely to be welcome. Unless it is very early in the takeoff roll say the first 1000ft it is best to wait till the aircraft is airborne.
A call from airline ops that the flight has left some bags would definitely not be cause for canceling takeoff.