How long do you usually have AF for? For me if I need more than a liner I count it as AF even if it's just for a day or so (cause AF only ever sticks around for 2 days anyway for me).
Because your temps have dropped in the last couple of days I'd say AF sorry

- but I'm no expert so that's just going by my personal charting history eg temp drop = AF about to arrive.
You might be having a funny stop-starty month. Last month I had AF for 2 days then nothing for a day then AF for another day. Weirdest cycle for me so far actually.