Immediate drop after spike?

Me
Hi Ladies, I am confused and wondering if anyone can help. On Wed my temp was 96.80 taken at 6:30a. Thurs it was 98.84 taken at 5:35a (I had to be up early then normal for a meeting). I assumed that was my spike and I had ovulated, but this morning my temp was back down to 96.86. Does your temperature fluctuate that much with the hour difference? Any guidance is appreciated as I am quite new to charting. Xx