Drastic dip at 9 DPO? Please help!

Jennifer • Married to my best friend 💕 Chemical engineer 👩‍🔬 SMD 12/11/2019 , expecting #2 January 2021

I was getting all excited for a triphasic chart and woke up to this, this morning. 😕 is this too large of a dip? Is AF coming 😕