Why Is There No Period Despite Taking Provera And Duphaston?

Hi, Iam mae single, 28 years of age. i have a pcos since im 19 years old. I need to take a pill to get my periods. but last month i come for vacation and have a check up with my ob she stop the pill and change it to provera and duphaston, so i take provera in 10 days, on 11th day i take duphaston until on the 20th.But the problem is i have no period and im waiting for it.now im thinking of? can i take a pill again? or wait again for another month.