I have been unwell for the past 2 days with fatigue, diarrhoea, headache, temperature, sore throat. My PCR result from yesterday’s test is negative. Obviously I may have something different, but I am concerned as I’m due to be mixing with relatives over Christmas and some are coming from another country. I don’t want to cause a problem for them flying home. How likely is it I may have covid but have tested negative? Should I repeat the test in a few days to be sure? Of course I won’t be mixing whilst I have symptoms and will be doing LFTs before Christmas anyway.