How do you take your basal body temperature? Do you need a thermometer made specifically for this purpose?
Basal body temperature (BBT) is taken orally with a special BBT thermometer. This type of thermometer will only register temperatures from about 94 to 100 degrees, and is graduated in easy-to-read, one-tenth degree increments.
Your temperature must be taken before any activity (and I mean any), first thing in the morning. The thermometer must be shaken down the night before, because even this activity can raise your temperature
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