deviry is a progesterone
which as you are taking for withdrawal bleeding only for 5 days so it will not give protection from pregnancy
, so better to take emergency contraception
as anovulatory cycles occur in PCOD the chances of pregnancy are less,
anyhow you take the pill,
if you want to post pone pregnancy better to take monthly contraceptive
pills with your doctor's advice which will give protection and also help in treatment of PCOD.