How long after the illness did you have the antibody test taken? My wife was tested positive in April, had all the symptoms, so it is almost 100% sure that she

How long after the illness did you have the antibody test taken? My wife was tested positive in April, had all the symptoms, so it is almost 100% sure that she actually had COVID-19. THe antibody test two weeks after the symptoms were gone was negative. The second antibody test a few days later was ambigous. She is planning to take a third antibody test next week.