Hi RK29824,
You local visa office will contact you to cancel one before they request any further movements from your side.
I'm sure they will ask you to cancel one before medical request. Sorry i couldn't find an exact person who ever faced the same situation, but if you try to search in this thread, i think there can be some results.
I personally heard a case who applied under both CEC and FSWP, at the stage before medical, he was contacted by CIC to cancel one of them.
so my advice is just relax, enjoy your remaining time in your home country, and prepare for a "COLD" reception from Canada.