I'm also in CO and had COVID-19 like symptoms about a month ago (fever and GI issues without any other major symptoms for a week progressing into a dry cough/heavy breathing -- completely unlike any other flu I've had). I never got tested due to lack of test kits here in CO at the time and because my symptoms stayed manageable I never saw a health care provider beyond a virtual meeting to get a rescue inhaler. At the…
If I had a blood oxygen of 89% I would have gone to the emergency room immediately. That's 80 year old smoker with emphysema levels. If you were previously healthy that is far more serious than the "light" covid-19 that many people get, assuming the reading was accurate.
According to interviews with doctors, corona patients experience lower than normal oxygen levels without that being a problem, until it gets very low.