10dpo drastic drop in BBT

Laura • ❤️Raising Warriors❤️ LJFG 31/07/13 ❤️ IKG 11/01/2019 ❤️ Rainbow baby 🌈👶🏼

I usually get a drastic drop the day before or day AF is due. My normal LP is 13 days long. 10dpo today - was feeling so positive this month and then boom...this change in BBT this morning! 😭 Is it likely AF is going to show early?