Just sick or pregnancy symptoms ?

C`

So I had sex on the second day of my period(Feb.11) . He did not cum in me or anything. Out of precaution I took a pregnancy test . Both tests that I took said “not pregnant” . On Saturday morning I woke up with a scratchy throat , then on Sunday night I started to get a high fever , and had a hoarse cough . I know the flu is going around but should I still be worried!