I guess taking the risk of 2 is worth it for some of us - in USA I read of a lady who transferred back 6 -7 embryos (day 2-3) not blasts of varying cell stages. Same article said only usually do 2 blasts.

Not that twins are bad but higher risk of complications

I am not sure of normal conception stats but read there are plenty more AC twins than natural concieved ones now I think.

In USA it costs so much there they give it all they have.Thank goodness we don't that happen here.