This sounds more like a behavioral issue, more like emotional eating triggered by boredom or anxiety, because:
A- the exact time of ovulation cannot be determined with certainty by counting the days of the menstrual cycle
B- the hormonal changes that occur during the menstrual cycle do not account for the variation in appetite.
You should try and occupy yourself with other rewarding activities to keep your mind off eating as the sole source of pleasure and self-soothing; read a book, go for a run, listen to music, catch up with friends. It is also crucial that you remain mindful of this behavior, so that you focus on healthy dietary choices instead of indulging in high-carb high-fat foods.