How do you report hours that vary week to week? (update)

I work some days through a staffing agency while still certifying. There are 12 people counting on me, so I am trying to be careful. Sometimes my paycheck is late by a week. Do you report when you earned it or when you were paid?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

In my state the question was about the week I worked, not the week I was paid. Read the wording on your form carefully, or ask the claims line.