Am I Possibly Pregant?

Jennifer
I was suppose to start my period yesterday but never did so I took a pregnancy test last night. I used First Response. It said negative. 
Today I had a little discharge but no period. 
I am planning on taking another pregnancy test tomorrow morning when I wake, as I read it was clearer results with morning pee. 
Has anyone ever had discharge and still been Pregant or received a negative on a pregnancy test and still was Pregant? 
Thanks!