I'm so sorry you got a
bfn.

I got those time and time again and it became disheartening after a while. One month, I finally just gave up. I didn't temp. I didn't even want to do the baby dance. Low and behold, we wound up preggers that month. I have no idea how it happened. I wish you all the best. Don't give up home.
AF is a crule trick Monther Nature plays on you. Hang in there. It will happen soon!