Hiya, Interesting question, and one that scares the hell out of me. What does it mean for us girls that arent fertile then! That we have less chance of it working? Its all so horrible and scary to think about, but am on a bad day as am having my test date tomorrow, but already know its a negative! (HPT) So am panicking that it might never happen for me! ttc for 5-6 years and going crazy slowly with it

tubal damage, so I guess a chance of toxins that mean implantation could never happen until i have tubes removed

there I go planning on doom and devastation again!
From my limited reading on the subject, some of the things that have to happen for IVF to work are really chance basis. Each embryo has a 50% to 70% chance of containing genetic characteristics that will allow it to develop beyond 2-3 day 6-8 cell onto to blastycyst (5-6 day implantation stage).
One of the discussions I wanted to have with my doctor was if transferring on day 5 could improval success rates. Afterall it means an embyo that 100% has made it to that stage has been transferred rather than one with 50 - 70% chance of developing. It doesnt cover off whether the embryo implanting, but it does mean you know youve got past one hurdle already.
In NZ this is still something in development, and something they only offer to couples who produce lots of healthy embryos that they can choose from.
My experience of IVF has been positive (despite the result of course!). The drugs were easy, and a few invsive moments, but honestly at this point there isnt much of anything I wouldnt try if it would improve my chances!! Sorry to hear of the big sh*tty BFN. I wish you all the luck with whatever you decide
