My FET is booked for Sunday. Hooray! Fingers crossed our last frosty survives the thaw! We're also using progesterone pessaries (crinone is 1 brand I think, not sure). In my case last time it was a case of trying something different to see if it helps, and we ended up with a beautiful baby boy that cycle so we're using it again. I think progesterone is used particularly if you have a short luteal phase but other than that no idea!