I'm still not 100% certain, but it is looking more & more likely that I had a false positive.
1/1: I was exposed to someone who later developed a fever, but who ultimately tested negative for covid (as did everyone else they and I contacted)
1/6: I tested positive PCR, but never developed any symptoms
1/9: I tested negative PCR
1/11: I tested negative PCR
1/15: I tested negative for the IgG antibody
According to my reading, most people should have had antibodies after 14 days, but some do take longer:
I'll get another routine antibody test when I donate blood on Feb 1. Even still, the
CDC's position is that 1 positive PCR means you had covid, regardless of however many negative antibody tests you get.