I had a coworker who got really sick around the same time. He had the PCR test done and it came back negative. There was definitely a bad flu going around at the same time as covid was popping up in the US.
Just a bad coincidence but I suppose I could count myself lucky.
Ended up just getting vaccinated, now I'll never know. For what it's worth, the second Moderna dose clobbered me like it was supposed to, so maybe it was busy making antibodies and I didn't actually get any immunity from February 2020…