Thank you for your question and for finding EmpowHER. I have been through dealing with ovarian cysts also. My doctor told me to chart my period by the one after treatment. If the milky discharge doesn't have a pungent odor, it's more than likely normal secretions you get during the course of the month. It may be a bit different given your treatment. Keep track of these things you notice on a calendar, so if you end up needing to call your doctor, you can clearly explain what's been going on. If you don't get your period this month, you may want to give your doctor a call just to check in and let them know what's happening. Hope that all makes sense. If you truly are concerned still, don't be afraid to call your doctor's office and ask the nurse your question. I know how confusing it can be when you have some sort of bleeding for seemingly a whole month.
For more information on ovarian cysts, check out this article: Ovarian Cysts
Good luck and let us know how you're doing.