Will the doctor think I’m wasting time?

Hi,

when I was checking my own breasts last week I noticed a discharge from my left nipple. No sign of a lump and it is not spontaneous discharge, only shows when the nipple is gently squeezed and only the left one. I've made a doctors appointment for Tuesday but I'm worried they will dismiss my concerns as there are no other signs. Am I right to see my GP with only this one symptom?