Hello Thanks for writing to us with your health concern. See basically with irregular cycles, ovulation just cannot be pinpointed or predicted accurately. You need to see a fertility specialist. You will need to undergo follicular monitoring. This is serial ultrasound scanning of the ovaries. It is done in order to track the progress of the dominant egg follicle, and to document the exact time of ovulation. Other option is to stay sexually active throughout the cycle. Also, there are tests such as I sure available in the market to predict ovulation, but follicular monitoring is more accurate. All the best. Take care.