How can you know whether or not you have covid19 without a test?

Covid Toes. That's right. If your toes are blue and they are normally NOT blue, you might have covid19. If you also have no sense of taste or smell at the same time, that's a pretty good sign that you should call your doctor.

I'm thinking about this today because I woke up with a sore throat, feel abnormally tired, and have been coughing and sneezing...but in my case, it's probably spring allergies.