Sometimes ovulation may occur earlier then expected based on calculating the number of days from your last menstrual period. It is likely that your body has triggered this ovulation on its own, just a bit earlier than you expected. I am not sure if you are on any medications this cycle, so please consider speaking with your reproductive endocrinologist regarding the specific details of this cycle.
Congratulations on quitting smoking, that is great for both fertility and overall health maintenance, and can be very difficult!
In terms of the question regarding the cyst: In a normal cycle, the follicle that releases the egg from your ovary during ovulation does turn into a functional cyst following ovulation, it becomes the corpus luteum, which produces progesterone during the luteal phase and will support a pregnancy if fertilization and implantation occur this cycle. If fertilization and implantation do not occur, this cyst usually resolves prior to the beginning of your next cycle. This is considered normal. Sometimes there are cysts which persist even if pregnancy does not occur, this may be what you are referring to. You should not be at increased risk for this due to the possible progesterone exposure, as compared to any other cycle.