My family members works with Covid patients and only wear a face mask, as is protocol for their profession. I actually left OP a message in a different thread where she asked the same question. So maybe some random people already have the answers like I do. I was on hold for over 180 minutes two weeks ago and got good advise on pre-testing for asymptomatic Covid concerns. For example; take a PCR test 12 days before your cruise if you work with Covid patients so that if you still have the antibodies you can get a doctor letter to show your in good health.
DCL also told me that because results can be inconclusive you should pad an extra 2 days into that number, so test 14 days prior to cruise. We are all here to help each other out, some answers although specific and/or rare occurring, usually can be fielded by someone. I'd never sell this group short with over 25 years of experience. Got me out of weird jams a couple of times(passports left on the plane, pre-paid DCL hotel rooms gone because of flight delays,..) I still trust this group over social media groups for information. They might have the larger member base, but this is where the experts with experience remain.
Hail DISboards!