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I do think that's sensible, you may be allowed to not self-isolate if you've had close contact and are vaccinated but I'm not saying that's a good idea!
is it normal that they take 5 days for results to come back at the moment?
Not in my experience, the two recent PCRs which came back for me I got results the next day.
It was after 4 days of not getting a result for the first one we started thinking something had gone wrong then when we got re-tested realised the guy never scanned the bar codes on our phones at the end to match them against the test kits..!
Are you double vaccinated? You don't have to self-isolate if so.
Also are you getting your own PCR test? If that's negative you don't have to either (and a good idea anyway).