Our expert says:
The use of BBT is rather crude and subject to various fluctuations. It also depends on the type of thermometer used. Some of the electronic thermomteres are rather erratic and can give you false drops in BBT. One is particulary interested in what is called core temperature and this is best measured by the old fashion mercury thermometers under the tongue.
It is very unusual, and I would say almost impossible to have a drop of bbt twice in a particular cycle. I would therefore question the sensitivity and methodology of the measuring device that you are using.
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