go to the IRS website and check your refund status. if nothing shows the next step is to
register to get a transcript of 2019 return. then you can see if there's a transcript.
if yes the IRS got it
if no call them before doing anything
if you had certain credits on your return - EIC or child care, those returns didn't start processing until 2/15 and a refund would take about 2 to 3 weeks from the date your return was actually processed assuming direct deposit. a check in the mail refund can take 4 to 8 weeks from the date it's processed.
