My ds is mostly nightweaned during the night but starts nursing again anywhere between 4:30 to 6:30am. I set my alarm every day for 7:30 and take my temp then, even if I was a awake say 45 minutes before. It has worked just fine for me. One thing that I think helps is that many nursing mamas seem to have a pretty consistant low temp. I have very little variation in my low range. That was not the case when I was charting before I got pg with ds.
Also, I have heard before and have found to be true in my case, that a study was done showing that temps were the same when taking immediately upon waking and after 3 minutes of jumping jacks. I'm not sure why so much emphasis has been put on not moving about at all before taking your temp. Most people think their chances of getting an accurate temp is out the window if they so much as go to the bathroom first. That's not been my experience. Maybe someone else has a different perspective they can share on that.
Do come visit us in the Nursing Mamas thread if you get the chance.
Tracy, doula and Army wife and homeschooling mama to A and E