You may be thinking that the professional measurements are showing up might look a touch different than you remember. The way measurements are taken changed in 2017 - this is industry standard in AB and highly recommended in BC.
The "new" way of measuring your home contemplates only interior spaces and only measures "paint to paint". This regulation change chance could bring your square feet measurement down as much as 10%. You will note balconies will not be counted but you can mention them in your home description.
One thing to note, all competitive homes have been measured the same so your competition out there on the market will be competing on equal footing here.