What Causes White Discharge Before The Menstruation?

Hello doctor, I consulted a doctor 8 days ago for whitening discharge for the past 5 days before the consultation. It was white in color and fluid and not foul smelling. She prescribed some medicines and after 3 days again I have gone there for consultation for acidity/peptic ulcer. But now I have a problem of delay in periods. I was supposed to have periods on 27th of last month but still now there are no symptoms. Please can u suggest me the procedures to make myself better.