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LESSON 09: CREATE YOUR OWN FERTILITY CHART>>

The coverline is a horizontal line drawn after ovulation to help differentiate temperatures before ovulation (low) and temperatures after ovulation (high).

Your coverline is drawn after you have clearly established ovulation.



Your temperature may go up and stay up above the coverline for 14-16 days after ovulation. That is called a "biphasic curve".


Q: What is the coverline in basal body temperature (BBT) charting?

A: The coverline is a horizontal line drawn in your basal body temperature BBT chart after ovulation has been established. It is drawn just above the last temperature prior to the first rise in temperature.


Q: How is a visual interpretation of ovulation and coverline done?


Q: What is a fallback temperature?

A: A fallback temperature is when your basal body temperature that was above the coverline drops for 1-2 days below the coverline.

A fallback temperature has no significant effect on a possible pregnancy
and the temperature for that day can be ignored.


Follow these steps to chart your basal body temperature (BBT):


The coverline is drawn after your basal body temperature has risen because of ovulation and stayed up for at least 2-3 days. Q: Are there any basal body temperatures that I should ignore when drawing a coverline?

A: The coverline is drawn after your temperature has risen because of ovulation and stayed up for at least 2-3 days.

This is called a "sustained" elevation and indicates that ovulation has taken place.


Q: How do I draw a coverline when fertility charting?

A: Follow these steps to draw a coverline on your BBT chart:


Q: How do I calculate my basal body temperature coverline?

A: When your waking body temperature rises more than 0.2 or two-tenths of a
degree higher than the previous six days, and it stays that way for at
least two days, you can start drawing your coverline.

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