The best way to track your ovulation
is to figure out when your next period is due to begin and count back 12 to 16 days.
This will give you a range of days when you will probably be ovulating. For women with a 28-day cycle, the 14th day is often the day of ovulation. To use this method, you must know how long your cycle usually lasts.
Google "how to track ovulation", to get various sites to help.