I have pcos I was on metformin 500 mg and duphaston since 4 months this month my Dr. added letrozole for 5 days and dis month I did't get my periods it's the 11th day I am having white liquid discharge which is making me feel wet and I am feeling exhausted but my pregnancy test is negative. This month I did't expect to be pregnant as my egg quality is not good, I was regular or my periods when I was on these medications but this month my period is skipped. When should I check for appropriate results.