Should I Be Worried About Delay In Periods Even After Taking Duphaston?

I am 25 years old and diagnosed with PCOS. missed my period for two months and was told by OB to take Duphaston to induce menstruation. I was asked to take 2 tablets daily for 5 days. I forgot to take my tablets on the third day..but proceeded to take the tablets the following day until i finished my prescription. It has now been 5 days since my last day of Duphaston and still no period. Is this normal?