Early waking, which basal temperature should I use?

Assuming that first temp was with at least 3 hours sleep under your belt, I would use the first temp. If it were me, though, I wouldn't use either temp. I would just skip today's temp completely. If your period is due this week that means you've already ovulated so temping at this stage isn't as critical.

Good luck Friday!

Use the earlier temp as it was take after more then 3 consecutive hours I assume. 1 individual temp would make too much of a difference. It is the big picture that you are looking at.

Rule of thumb is to just throw out today's temp. Missing one day this late in the game won't hurt.

You can also take the first temp and add (i think) a tenth of a degree every half hour until your normal time.

But I would just throw it out.

best way to detect ovulation is to combine a daily reading of your basal body temperature (your temperature when you first wake up in the morning) with monitoring the texture of your cervical mucus. Chart your cycle for a few months so you can recognize your pattern and have a better chance of predicting your most fertile days.

How to do it: Start keeping track of your temperature on the first day of your period using a basal body thermometer, which shows minute changes in your temperature. A digital thermometer can also work, although it's not as accurate. Take your basal body temperature, and plot it on the chart. Then go to the bathroom and check your cervical mucus. Using your fingers or toilet paper, note its consistency. You may also want to monitor its texture throughout the day each time you go to the bathroom. Most women will see a spike in their temperature, signaling that they've ovulated, and notice that their mucus looks and feels like raw egg white at around the same time. When the two coincide, it's baby-making

No don't use the earlier temp, use the one closest to your normal wake up time.