I did one on Sunday because I felt grotty and I was meant to be in work on Monday, I have to do them 2x a week. I tested negative. Had an asthma attack that night got rushed to hospital treated and then tested for covid because I had 2 out of 3 symptoms.
That PCR test was positive
My truest have actually stopped using them in the last couple of days because of the high level of negative results, they decided to check them with pcr tests and there was a huge increase in positive because the lateral flow didn't pick it up.