Since no one else has responded, I'll take a stab. I'm not an attorney but have worked with IP attorneys in Canada as well as in the US, and I believe Canada has similar requirements for maintaining a registration as does the US. Primarily, those requirements revolve around using the mark or the registration can be cancelled or successfully challenged in court. If you have registered your mark in Canada, and are also using it to offer your goods/services in other countries, i.e. the US, why not file for registration of it here as well? You want to use your mark to gain distinctiveness of use relative to your goods/services as that will ensure the continued validity of your registration.
In short, I do think you are paranoid for the wrong reasons. If I am incorrect, an attorney will no doubt submit a correction. Hope this helps.