Low BBT, no period

Ki

Should be 16dpo today, low bbt for 3 days already.

Usually there is at least spotting at 14dpo, regardless on temps, but this time nothing at all. Also, normally, after a big drop AF comes either the same or the following day. No signs of anything, only cramping on and off for days.

BFN at 12 or 13dpo.

Has anyone experienced something like it?

Did AF come eventually?