When is the Pre-AF drop to be expected?

Catherine • TTC #1 @37 via IUI/IVF

This is my first month temping. I’m pretty methodical about it (record the average of 3 readings 👩🏻‍🔬). Even though I’m on progesterone suppositories, should I expect my temp to start declining if I’m not preggo? AF due in 4 days (2/17). Pretty impressed with my skills here 😝