Not everyone notices the changes in cervial mucous, but that does not mean you are not ovulating. To better track your ovulation, ovulation predictor kits can be very useful. They detect the LH surge which tells your body to ovulate. One the surge is detected by the kit, it gives you a 24-48 hour window for ovulation, giving you the ability to try to conceive on your most fertile days.
Good Luck!
Try taking ovulation tests after your period every day till your next then should help you keep track for the next time