Wage reporting when hours change weekly (Seattle)

I work some days through a staffing agency while still certifying. I would rather hear the honest version than the polite one. The form asks for gross earnings, which I do not see until later. Who can I ask without risking my claim?

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

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.