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In my experience, and that of a few friends, LFDs worked great for our first infections but seem to be fair less sensitive for second and third.
I had COVID over Christmas and only had a faint pos test on day six or seven but was neg for other days. Same for my wife. Total guess but I wonder if you generate/replicate as much of the virus when you're on your second or third infection...
Personally I'd assume that you have COVID.
I live with my Dad and he is testing positive for Covid. I’ve had cold symptoms for 2-3 days and testing negative. Could the lateral flows not be working? Or just coincidence I’ve got a cold the same time he has Covid?