Reporting part-time earnings while on benefits - 2 months and counting

I work some days through a staffing agency while still certifying. This is my first time dealing with any of this. Pay posts on a different day from when I work. Who can I ask without risking my claim?

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

Thanks for writing this out. I went through something close to it 2 months ago, and it got easier once I kept a simple log of every call and form.