Most professions really do require a certain level of understanding of the local laws related to the profession. I haven't been through the Canadian immigration process, but I suspect that what most countries are actually looking for is the experience rather than simply the uni training. But even at that, for something like nursing, there are some rather major differences in how that's done between North America and Europe - probably even between the US and Canada.

Most countries do put nurses through some amount of re-training in order to integrate them into the local system. But they are assuming you have the patient care side of things in hand. Any chance you could put off your nursing training until you are settled in Canada with your husband? That might make the process a bit shorter and eliminate the need for re-training.
Cheers,
Bev