Are you new to charting? I've been charting for over 4 years now, and have found temping during the day only adds confusion! I would recommend only temping once in the am also to avoid confusion and possibly inaccurate entries. Its best not to adjust your temps or discard them. Also if you're temping orally/vaginally its better to stick with that one method....one temp in your cycle doesn't mean much. You're looking for an overall trend in your chart. I temp vaginally and my temps are almost always above 98.0, and in the 98.5-98.9 range post O. I've had hyperthyroid problems, but was just retested and my thyroid levels are normal. I don't think temps alone can point to an under or over active thyroid, but I could be wrong.
If you're having hypothyroid symptoms, I would suggest going to your doc for a simple blood test to check your levels. Its so simple and may put your mind at ease. Oh, I started charting orally in 2004 but switched to vaginally temping in May 2006. HTH