oh, okay :-) maybe it was a silly question :-) it is my first month charting, and I still have a lot to learn :-)

Fever thermometers aren't sensitive enough because they round temps. With a bbt thermometer you'll see very small differences in temps. It's easy to spot a fever thermometer on charts because every temp will be round, nothing in between, with a lot of flat spots.

thank you for your answer Kelly. I have a regular digital thermometer, not a basal one. But how do you see it from my chart?