I had my first IVF late last year at the age of 32 and wasn't asked about how many to transfer until I was sitting on the table about to have it done. I remember thinking surely we should have discussed this earlier in the process!

Whilst I had a choice, I was strongly encouraged to transfer only 1 (which we did, in spite of DH wanting 2). We transferred 2 for IVF#2 and will transfer 2 again this time.