So many people are getting it, including a lot for the first time who are super careful and wear masks (that i know irl and online). I presumably have it, all the symptoms but haven't tested positive despite being on day 6
Please do everything you can to protect yourself and others 
If you have symptoms and the covid test is negative, try swabbing your throat. .
If you do test positive, get paxlovid.
And it's probably a good idea to get anti virus nasal sprays, on top of masking. I'm alternating between covixyl and betadine.
It may not prevent infection entirely, but it will likely reduce viral load, and may help clear the virus faster. And if you have symptoms test before you use them.