How do you report hours that vary week to week? - 22 weeks in

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. Sometimes my paycheck is late by a week. Who can I ask without risking my claim?

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.