[InnerKnitter]

what time do you chart? The earlier in the morning, the lower it will be. I used to temp at 5:30 or so when DH would get up for work. My BBT was around 97. Now I temp closer to 7:30 and range between 98.2 and 99.2 so that may affect things. Also is the window open, air conditioning on, how many blankets do you sleep with, how warm are your pajamas... all of those things affect your waking temperature.

If you still think its oddly low, the room could be cold, making the thermometer cold and creating a cool spot under your tongue (or where ever you are temping). I let it run once on the left side under my tongue to warm up and then re-temp under the right side. I record the second temp, gives me a little more accuracy.