The advice is to self isolate if you have travelled from certain areas abroad, even if you have no symptoms. We know in other countries that not everyone has followed this advice.
So be honest, if you had no symptoms but were told to self isolate for 2 weeks in the house, would you? This would mean not leaving the house at all and staying in a separate room from anyone else living in your house.
YABU - No I would not
YANBU - Yes I would