I'm no pro when it comes to the ins and outs of Covid testing with regards to false negatives and false positives, but what we were told was a person is more likely to get a false negative from the rapid (antigen) test if they have no symptoms. That might stand to reason that it might give a false negative early on or later in the disease for that same reason, but that's just an educated guess.
On a separate note, if a person has symptoms and still tests negative with the rapid, they should be getting the PCR for follow-up. Likewise, people with significant exposures that test negative on rapid should also have confirmatory PCR testing. Symptomatic patients that test positive on rapid are not routinely being followed up with PCR b/c rapid test false positives in symptomatic patients is less likely.
P.S. Glad to hear your case was mild.
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