To find your 2019 earned income go to IRS.gov/transcript. If you do not already have an account, you may have to create an account. Once you create the account you will be able to sign in and request a transcript.
To request the transcript after you create an account:
Sign into IRS.com/transcript
Select the transcript you want. You are going to want your Wage and Earnings Transcript.
Select the Tax Year
Anwer the rest of the questions
When done you will be able to get a download on your transcript.
The Wage and Earnings Transcript will provide you all sources of income that were reported to the IRS. (W2s, 1099-R, 1099-INT, 1099-DIV, etc.)
To verify Form 8812 and EIC, you could also request an Account Transcript and a Return Transcript. It is done the same as the Wage and Earnings. One of these transcripts should show if you had EIC or a Form 8812.
If you had an account that prepared your return for 2019, I would suggest you contact the accountant that prepared your return and ask them for a copy of your return and specifically Form 8812 and the EITC.