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You're right, it seems okay. I guess I'm just feeling a bit of anxiety about it and want to know that anyone I can't personally inform is told ASAP. 3 days just feels so long.
yoshy-
Well it's two days from here: https://www.gov.uk/government/publications/covid-19-stay-at-home-guidance/stay-at-home-guidance-for-households-with-possible-coronavirus-covid-19-infection
For those who can't be arsed to follow the link and read
People who have COVID-19 can infect others from around 2 days before symptoms start, and for up to 10 days after. They can pass the infection to others, even if they have mild symptoms or no symptoms at all, which is why they must stay at home.
lynx
Almost certainly none. The incubation period is around 5-6 days for Covid-19, it would be very rare for someone to become infectious (to the point of being able to spread it themselves) after just 3 days from initial contact with the virus.
(Of course, you need to measure the time since the contact you made when you were likely positive, not the time since the positive test, and the former is likely to be 1-2 days longer given normal test turnarounds.)