Deductions & credits

How do I find out if I used my 2019 income to calculate my earned income credit for 2020? My refund was filed in Jan but it is still processing. When I checked my transcripts on the IRS website the earned income was lower than what TP calculated. It also appears to be calculating based on the earned income amount - minus the unemployment. But my adjusted gross income is higher than the earned income. I can't remember if I selected to use my AGI from 2019 or if this is something TP automatically selected for me? If not, can I amend my tax returns and take this relief credit?