I missed my period since october last year, i have polycystic ovaries, can i still be pregnant?

Yes: If you have not had your period, you can certainly be pregnant, despite having a diagnosis of polycystic ovaries. You should do a pregnancy test.

Yes: It is possible so a pregnancy tests would be wise. But you really need evaluation of the uterus to make sure there is no pre-cancer building up by missing all those periods. The longer your periods are irregular especially with pcos the high the chance of pre-cancer and cancer over time.