Is there a way to manually add that I didn't receive the 1st round of stimulus for me or my 2 kids? I never got either round but it only added the 2nd round to my return

When I tried to file on Credit Karma it did allow me to check each stimulus and I was going to receive both, but I had already filed with Turbo Tax. I am kicking myself! Should I amend? If I do, I'm not sure if there is even a way I can fix this issue. Anyone have advice?