My DD has symptoms of Covid - a cough, headache and a cold but every single test LFT she has done comes up negative. She has done 10 over the last few days and not even a feint line. Two of her friends currently have covid. Do we presume this is right or does she need a PCR. NHS website says she doesn't need a PCR if LFT is negative. My dad says she needs to get a PCR before school tomorrow so she doesnt put others at risk! So confused.