Late period BFN

Molly-💍💙💙🐕

This months IUI was cancelled on day 14 due to my body not responding to the GonalF that was added to my treatment plan. Today is cd 39, I am usually very regular. I have been testing every other day and I keep getting BFN. Has anyone had this happen?! If AF is coming she needs to get here so I can get a move on with the next IUI!