Postive HPT, but negative Clear Blue digital :(

Hi!  I started taking HPT yesterday AM, PM and this AM.  All positive with a faint line (posted below) but then I took clear blue digital this afternoon after a workout/run and it was negative...  My expected period date is sunday.   Anyone experience this??
I have been having cramping and watery discharge since 3 days ago.  So upset, dunno what to believe.