Question: My probationary period passed three days ago, I have not been told if I passed it, and I have my evaluation early next week. Should I assume that I have passed probation?

Answer: 
Check your contract. As a fellow Canadian, usually when I've seen probation contracts, the probation period is set by a specified number of days, not by an evaluation procedure. If that's what your contract looks like, then congratulations, you passed!

I have never had a formal meeting in any job to discuss passing probation; I have only had such a meeting when I failed it. If you are confused, you should ask your manager, but your manager will probably think you're being silly (not in a bad way, just in a "isn't it obvious?" way).
You should wait until any official confirmation.

I had a similar situation 4 months back, the confirmation meeting was delayed because of too much work.
Since you know your meeting is next week, you should wait until then.
In the meantime, you can take feedback from other colleagues about your performance to ease the pressure.