I don't believe this is correct. The processing instructions here:
http://www.cic.gc.ca/English//resources/manuals/ip/ip02-eng.pdfIndicate to me that if you had a spouse at the time of the PR who was not examined, then they will be excluded from the Family Class. I believe you will have to tell the VO of the change and have your spouse examined. This may take some time, since she now has to pass the same hurdles you did with regards to security and medical.
The relevant portion of the document is
As per R125(3) (a), R125(1)(d) does apply, regarding an applicant, if an officer
determines that this applicant could have been examined during the sponsor's own
application for permanent residence, but that the sponsor chose not to make the
applicant available for examination or that the applicant did not appear for
examination. The choice in this situation rests with either the sponsor or the
applicant (not with an officer of the Department) and, considering this, the applicant is
excluded as per R125(1)(d) for not having the family members examined as part of
the sponsor's own application for permanent residence.
I think you are safest to tell them you are now married and add your spouse to the application.
I could, as always, be wrong though.