1 attempt for us, thankfully.
You are right - there is no guarantee of a pregnancy.
We tried everything in the book to sway for a girl for our third baby. It just doesn't work. High tech is the only gender guarantee.
It's a lot to think about, a lot to take in. All I can say is IVF is no where near as bad as I had thought it would be. The shots were easy, honestly. And I had zero side affects. We still went about our daily lives and no one knew.
I'm sure you're overwhelmed with the thought of it all, I know I certainly was. Emotionally & ethically. I found this board and the "Microsort & PGD" board to be a big source for support.
Best wishes to you!