Well the CDC way isn’t how my test was done🤬

So in light of my test results that came back negative, yet I still have a fever and don’t feel well I was looking up the test practices of how it should be done. And of course everywhere that I read says that both sides of the nostril should be swabbed. Of course they only did one side of mine and that was a side that they already rub the swab around earlier for a flu specimen so now I am wondering did they really get an accurate test? Or did the flu swab beforehand remove whatever they were looking for? Or do I really not have it? So do I feel any more relief right now, not really I’ve even attached the page from the CDC that says how to do the swab, highlighted below!!