My FS is also against transferring 2 because of my age. He said if I was 39 or 40, he wouldn't hesitate, but as I am only 30 I have a good chance of getting pregnant through IVF and there are too many complications with multiple pregnancies. I asked my nurse about transferring 2 in our last FET and she was definitely against it. Seeing as my FS was away on holidays, there was no way it was going to happen on her watch! Oh well, I tried!