It appears that if you’ve had COVID within 3 months and have recovered, you don’t actually have to quarantine if you’ve been exposed, according to the CDC.
And “People who had COVID-19, recovered, and completed 10 days of isolation and then during the 90 days following the end of isolation come into close contact with someone with COVID-19 do not have to quarantine or get tested if they do not have symptoms.”Source: CDC Quarantine and Isolation