question: I've been charting bbt and I'm a little on the low side - around 96.5 in the follicular phase and 97-97.5 in the luteal phase.  Just on whim I took a temperature reading several hours after running a half-marathon assuming my temp would be higher than normal, but it was 94.0.  I took it twice to be sure.  I didn't feel uncomfortably cold or warm, after getting in a hot bath (for my sore muscles) it went up to 98.3.   What should I make, if anything, of that low temperature?