It can take up to 14 days for symptoms, hence the 14 day quarantine.
Now you know your friend has COVID, you could also have the virus, you need to stay away from people, quarantine yourself, this is the only thing you can do and take a test.
If you do not, you could infect someone else, the bubble will continue, you could be responsible for someones death.
Best wishes and hope you´ve not contracted the virus, it develops different in everyone
