WTH, good luck with the provera. I remember it turned me into some sort of crazy person that I really hated being around - majorly *****y and just horrid!

When it comes to defrosting rates, I have a defrosting rate of around 30-35% (it all depends on whether you count the one that had to be defrosted on the morning of transfer because the one before it died overnight... but they start with the best ones first and work through to the bad ones, I'm convinced that if the one before and the one after couldn't survive over night, then this one wouldn't have either, but it only had a few hours before transfer - the clinic swears it was fine, but I'm not convinced), which my clinic assures me is not normal and is an indication of other problems. All of these were blastocysts resulting from quite severely hyperstimulated cycles. Defrosting rates are generally a lot better than that. Sadly, you don't know what it's likely to be for you until you are trying it, but we can certainly hope that a frozen cycle isn't necessary.

Just one more thing... my clinic had me convinced that the only way I'd fall pregnant and not miscarry was if we used a blastocyst embryo that had survived freezing and thawing - the processes of growning to blast and freezing/thawing would weed out the dodgy ones that would never work in the first place. We didn't get many usable eggs on our third stim cycle and couldn't afford to wait to day 5 and transferred on day 3. For all that they were certain it needed to be a defrosted blast to be able to work and stick, I'm now over half way through a pregnancy from a fresh day three embryo!

They may act like it's science and they know what's needed, but it really is more of an art form and just sheer blind luck as to what will and won't work.

BW