Do a mock first! I made a very bad expensive mistake and didn't do a mock before my first DE cycle, and lo behold the day before transfer I dropped my lining and had to do a freeze all! Turns out my body didn't agree with the type of estrogen I was on! Be patient and take the time to do the mock and try to get everything right so you know going into the cycle you can feel confident at least in your lining!
Sorry to hear about your BFN!
All my best!