I would ask - what gives you the best chance - day 2 or day 3 or day 5? I felt as though I had to research this myself and ask for what I wanted - which ended up being defrosting 3 x day 3 embies and trying for a good day 5 blastie. When I asked my FS was happy to do this but it wasn't suggested as an option, I did have to ask.

I would ask also about repeat FETs - can you keep going mon on month without a break if you want to?

Xx