Need to amend?

I e-filed my taxes over the weekend. I used Turbo Tax Free to do so. I only had one W-2 to report, or so I thought. I left a job the last week of December 2017, so I didn't think I had made any income from them in 2018. But I forgot that I was sent a check for $161.37 for owed vacation/sick time after I had already left the position. I did not receive this check until January 2018 if my memory serves me correctly. So now I need to amend my returns. My federal return was just accepted by the IRS yesterday, my state return is still in pending status. What do I do now? Thanks.