How do you report hours that vary week to week?

I work some days through a staffing agency while still certifying. It has been weighing on me all week. Sometimes my paycheck is late by a week. Do you report when you earned it or when you were paid?

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.