All cartridges working at or around 20K/PSI won't show signs of overpressure by reading the primer cup.The 9mm working at a little over 30K might give some.
A chrono will give a much safer indication since velocity is most of the times(not always)directly related to pressure. Brass expansion is the safest sign to measure but not an easy one(very small increments mean a large difference;thus one needs accurate measuring instruments).
But a primer that has changed shape,except for the firing pin indentation(harder vs softer primer cup material,firing pin hole much larger than the firing pin,harder vs softer spring strenght,etc,)must always be analysed and taken into consideration since this is normally the first readible sign.And when in doubt,don't go any further and seek good advice.
Keep the sport safe!
Qc