BFP and bbt tracking

Renee • Married 11/9/14...BFP 6/28/15...DD 2/25/16, BFP 3/29/2019, MC 4/12/19 👼🏻, BFP 🌈 6/12/19, DD 2/4/2020
So I got my BFP Sunday and I've been checking my bbt every morning still, it spiked the night I got the BFP, it's remained high but is it normal to fluctuate like this? I've been checking my temp between 415-445 because ever since I've found out I've been waking up earlier than normal...anyone with insight?