Temp drop way below coverline at 7dpo

Okay guys help me out on this because I am freaking out! Today I'm 7dpo since 1dpo my temps have been between 97.9 & 98.0 yesterday when I woke up and took my temp it was at 98.3 and this morning it took a huuge dive to 97.5 which usually doesn't happen until after AF starts. This is the first time this has ever happened and usually after O my temps will stay elevated until 15-18dpo and drop. Could this mean that I'm out this cycle and AF is going to show early? Any insight to give me peace of mind. 😔