Thanks for the query.
As you are taking combined hormonal
pills, they will give protection from pregnancy
along with treating poly cystic ovary disease.
So, if you have taken contraceptive
pills with out missing, no need to take the emergency pill actually.
Repeated intake of emergency pills can lead to problems.
For more details : http://srsree.blogspot.in/2012/08/emergency-contraceptive-pill-short-term.html
But as you are taking the contraceptive pills for poly cystic ovary disease, you have to continue them.
Usually hormonal pills to be taken for around 2 to 3 months to cure the PCOD
After that ultrasound
is needed to evaluate the status of the PCOD.
And depending on the findings further treatment can be planned.