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What does the vertical line called Possible Ovulation mean?

OvaGraph uses a combination of BBT algorithms to interpret your temperatures. In many cases, the results of these different tests will show the same ovulation date. However, if you happen to have more than one temperature rise (that fits the algorithm's definition of a "rise") in a cycle around the time you saw fertile cervical mucus/fluid, it is possible that you will see both a Likely Ovulation day (displayed as a dark purple vertical line) with a cover line AND a Possible Ovulation day. The Possible Ovulation day will be displayed as a purple day. If you see a Possible Ovulation day, we recommend that you consider the Likely Ovulation day and the Possible Ovulation day in relation to all of your other fertility signs to determine when you ovulated.
If your Chart Settings is set to BBT Mode:
OvaGraph uses a combination of BBT algorithms to interpret your temperatures. In many cases, the results of these different tests will show the same ovulation date. However, if you happen to have more than one temperature rise (that fits the algorithm's definition of a "rise") in a cycle, it is possible that you will see both a Calculated Ovulation day (displayed as a thick red vertical line) with a cover line AND a Possible Ovulation day. The Possible Ovulation day will be displayed as a thin red vertical line. If you see a Possible Ovulation day, we recommend that you consider the Calculated Ovulation day and the Possible Ovulation day in relation to all of your other fertility signs to determine when you ovulated.
Sarah - OvaCue Specialist