Maybe, but it's only really an issue if there's low-prevalence of covid at the moment of testing (bayesian probability).

But it's also easy to test multiple times, and often enough the symptoms will confirm it.

I am pretty sure it is the opposite. I used antigen tests which are less reliable.

I did not mean to confirm the parent, but give a version that is similar but probably just chance.

Rarely, false negatives are way more likely than false positives.