15dpo and no AF...

Hi! I’m feeling rather awful about my predicament and hoping someone can help. This is my 5th cycle of letrozole. I’ve had one CP during this period of time. I’m now 15dpo and have been getting nothing but BFNs and then a few VVFL evaps several hours after taking. I’m so upset and feel defeated. I stopped progesterone a few days ago and so AF should be here by now. I had a clinic consult for 3/29 which was moved back to 4/8 this morning, which is devastating. I’ve been waiting 8 weeks for this appt.

Anyway, anyone have BFNs up through 14dpo and then discover pregnancy after AF is due? Thanks in advance ❤️