You can't know for sure if you've had it without testing. The mild version is like so many other infections in terms of the way you feel.
I would just like to know if there is any truth in the link I posted. My lack of sense of smell or taste has been bloody awful for several days now but until a friend posted the link to its possible connection to Covid19, I just assumed it was that I must have had a sinus infection. All normal colds go straight to my sinuses but I have never experienced anything like this.
Unless the link is from an official NHS site, I think you can safely treat it as utter poppycock.
If those were related symptoms, I think they would be listed on official websites, or on sites such as the BBC, and so far as I am aware, they are not.
If people in your Choir was it, that you last saw almost a fortnight ago, might have had it, your 14 days isolation is almost up already, and if the feeling of mild feverishness from 7 days ago was the virus, then again, the seven days isolation from having symptoms is also about over.
That said, it is not confirmed that having the virus necessarily makes you immune, so essentially the best option remains to carry out sensible precautions.