BFN and no AF

Hi I had been on BC for 12 years and only taking placebo every 3rd pack for the last 4 years. I stopped BC in mid-July and had a period.

I’ve been tracking and my BBT is alllll over the place. It was good up until I think I ovulated, but then all over. I had to throw out my thermometer because it sucked. But I had positive OPK and EWCM.

Now I’m CD 40 and 17 DPO...all BFN. I’m new to all of this so no clue when I should be feeling or thinking anything.