Which temp should I use?

I woke up at 4 am and took my temp because I thought it was time (I was very confused this morning) My temp read 96.90. I then went right back to sleep. I woke up at 6:50 my regular time to temp and it read 97.55. I’m due to ovulate today.

Which temperature should I use? One would possibly mean I ovulated (after two more temps) the other no.