From the NHS website re: if you test positive -
Keep self-isolating if you have any of these symptoms after 10 days:
• a high temperature or feeling hot and shivery
• a runny nose or sneezing
• feeling or being sick
• diarrhoea
Only stop self-isolating when these symptoms have gone.
I don't remember seeing runny nose? Or feeling sick on the list before only a high temp?
www.nhs.uk/conditions/coronavirus-covid-19/self-isolation-and-treatment/how-long-to-self-isolate/