I had coronavirus a few months ago but I only just found out

I just signed up to donate my plasma.
This is a story I’ve shared with only a few people close to me, but am sharing more publicly now that I’ve had the result back.
I’m SARS-CoV-2 IgG antibody positive.
A couple of weeks before we knew that COVID-19 was so prevalent among us or testing was even available, I developed some symptoms of a dry cough and sore throat.