This is quite a dip!

Hi mommies and future mommas. I am 7dpo today according to FF. But I have a bbt dilemma. I usually take my bbt between 5:30am to 6am. This morning I took it at 6am and got a 97.05 temp. That's wayyy below the coverline so i immediately re-tried and it said 97.92. Tried charting them and this is how they would look like.

Chart 1: 97.05

Chart 2: 97.92

What temp would I use? Or do I just discard today's temp? Need your insights please.