Sending an invoice does not, by itself, make you an independent contractor. How the work is arranged matters more than the label on the agreement.
Review how the job is arranged
The provincial guidance considers factors such as who directs the work, supplies tools and carries on the business. Keep the agreement and details of how you actually worked.
Check whether employment standards cover you
Genuine independent contractors are generally outside provincial employment standards. Until your status is confirmed, the calculator can only show what the employee minimum-wage comparison would be.
Ask about your situation
Contact Employment Standards with the facts of the job, or speak with your union if an agreement applies.