Hi Avocado and thanks for the welcome!
Yes, I am one of life's worriers, so thought it bet to get an 'insurance policy' in the freezer ASAP
. Still no idea if this will even work, but I can at least look back and know that I did everything I could.
The plan has always been to thaw them all, culture to (hopefully!) blast, transfer the best one and refreeze any left over (apparently freezing twice has no effect on live birth rates either).
My clinic are very positive about the whole idea of freezing embryos - they have a really good success rate on thawing and see no difference in live birth rates between frozen and fresh embryos. My consultant thinks in a few years, everyone will 'freeze all' and then do the embryo transfer at a later date.
Actually looking at the calendar, DS would have been 5 months old when I did the second cycle, but yes, my clinic were very positive about the plan. I didn't breastfeed, so no issues there.
Doesn't stop me having a huge wobble though, what if none of them survive the thaw? 
Do you mind my asking how you came to be having a FET? I'm assuming its a follow up to a recent fresh cycle? You sound like you're on the longest of long protocols!