There's even ovulation tracker apps! The app analyzes the data that you provide (input your menstrual days and for some apps, even your basal body temperature) to make accurate predictions regarding your ovulation days—your most fertile time. Important to note that for women who do not ovulate regularly or have irregular menstrual cycles, the use of an ovulation tracker app is of little benefit.
Additionally, your body may signal when you are about to ovulate. Many women feel twinges in their lower abdomen (your ovaries are on the right and left sides of your lower abdomen). Other women notice clear, stretchy vaginal discharge just at their fertile time. Your doctor can also request an ultrasound or appropriate blood tests to determine ovulation.