This is my anecdotal experience. I was considered fully vaxxed(Pfizer) back in April. Last month I caught, as people used to say, a cold. Usual symptoms, moderate cough, sneezing, runny nose. I was back to normal in a few days. I drank a lot of orange juice and had chicken soup everyday.
Happened to me the same way last November, but I got tested and it showed as COVID. Doc said treat it like a cold unless it gets worse, then he'd prescribe something. It didn't. But now I know that I have the natural immunity. Were you tested?