New to BBT - Help please πŸ˜”

KK β€’ #1 Jan β€˜20 πŸ’™ #2 Jan β€˜23 πŸŒˆπŸ’™

Hello! This is my first time charting my bbt. Does everything look okay? I was surprised to see my temp drop at 1 DPO today as I thought I would get 3 days of increased temps. Advice please!

Also, how do I get my cover line to show?