Question about overlap between 5 day test results window and possibility of being contagious due to recent exposure after testing.

Sep 1, 2020
Question: If I were to get tested as a precaution 5 days before visiting someone (Test results window is 3-5 days), then hypothetically get exposed to the virus sometime during that 5 day window (or maybe even a few days before testing if it takes awhile after getting exposed to show the markers that would result in a positive test), then what is the risk of being contagious if I were to visit someone on day 5 and hypothetically be in the pre-symptomatic stages at that point? Assuming I would be in close contact with this other person? Low risk/high risk? Low viral load/high viral load?
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Aug 29, 2020
This is where the whole thing falls down

If in UK then unless mixing with someone vulnerable forget about infection because the UK has a rising infection rate and a lowering death/hospital rate