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If you have regular periods with a cycle of 21-35 days, this suggests that you are ovulating regularly. If you experience Mittelschmerz (mid-cycle pain associated with ovulation), changes in your cervical mucous and increased temperature mid-cycle, these features also suggest that you are ovulating. However, to be sure that you are ovulating, the key medical investigation is to measure the concentration of progesterone in a blood sample taken seven days before your expected period is due. If you have an irregular cycle, then several samples may be required, each taken a few days apart. Progesterone is only produced in high quantities after ovulation, so a high progesterone level means that you have ovulated. If you are not ovulating, then further hormonal assessments will be required to identify the cause.