We had 2 embryos transferred but it's a bit unusual because we have 2 bubs in one sac and the other sac is empty. So it looks like one embryo has not progressed and is a blighted ovum and the other one has split, meaning identical twins.
It was too early to see if the twins had a membrane between them at 7 weeks so we're hoping that tomorrow we'll be able to see a dividing membrane. It's better if they are in separate sacs, sharing one is risky.
So newmummy2b, you had 2 transferred too? We were on our first cycle of IVF too. Feel so fortunate. Good luck!!