PCOS can cause rocky temperature trends due to hormone imbalances. The effect on temperature varies from one woman to another.
The good news is that Tempdrop will be able to detect your true nightly sleeping temperature and give you the clearest and most accurate temperature readings you can possibly get. This way you will be able to keep track of whether or not you have ovulated.
To learn more about the benefits of charting your temps even if you have PCOS, you can read more here.