How do you report hours that vary week to week?

My hours change every week at my new part-time job and I am afraid of reporting wrongly. I do not usually post, so bear with me. The form asks for gross earnings, which I do not see until later. Did anyone get an overpayment notice from a mistake?

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.