Clearblue advanced ovulation kit

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I have tested and kept getting low fertility; then tested and got high fertility for a day and it went right back to low fertility the next day . I never had a peak fertility day at all. usually the high fertility days lead up to peak fertility. HF usually last four days and then rolls into a peak fertility! But it was only high for a day; right back to low; no peak. Am I not ovulating this month or what ? So confused !