Thanks peeps. I'm leaning towards one, then if unsuccessful two - that's assuming they all thaw correctly.

DW was (yesterday) leaning more towards two straight off.

If we did do two to start with and neither took, then the clinic suggested keeping the remaining one on ice and doing another stim cycle. Sort of sucks because we had it in our heads we have three FETs before having to worry about another stim. If we do two first up, we may only have that transfer before doing a stim again.

Will probably wait until DW's ultrasound and ask the FS if she is the one doing it. Otherwise we'll just ask her to call us and seek her advice as well.