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 
Home tests have a 30% or so false negative rate per test if you do them correctly and you're in a phase where there's enough of the virus for the test to detect. Ideally you want to do like three tests on three consecutive days, and even then there's ~10% chance of getting a false negative.