Bfn 12dpo but af no show? What’s your experience?

Alex • ✨ Due March 2021 after 4 IVFs, 2 transfers, and 1 anembryonic pregnancy ✨

I got a bfn 12dp. AF was supposed to show yesterday/today, but instead of AF, my temp went back up. Has anyone ever experienced this? Did af come late or did you get a bfp eventually? Here’s my chart. I don’t want false hope, but I am curious. Orange line is my rhr, which is also low, which makes me think I’ll get a bfn if I test.

Update: doc says it’s going to be a chemical pregnancy based on my levels. Seems like implanting at 13dpo was too late for my lining to support it (or it implanted late because it wasn’t viable anyway). Just heads up for future ladies reading this.