Cycle Buddies AF Dec 22-24

Hi, I'm Lilian. This is my first cycle TTC with #1. I've been tracking/charting for years now for birth control. Excited to be tracking for pregnancy achievement finally! Cycles are usually 29-30 days. Expecting AF Dec 22, but hoping not. Not planning on buying pregnancy tests since I'm an experienced FAM charter. I'll know by Christmas most likely if pregnant via 18 high BBTs in a row. Anyone with me?