No too worry mate,
I see enough people refer to a "cMBP" as a MBP which has a none Retina display.
As long as you provide abit your MBP's release information (IE Mid 2009). Im sure there will be plenty of people with the knowledge of what model you have.
It does beg the question where this whole "rMBP" came from - Apple certainly dont appear to refer to it as a "rMBP" anywhere!?