I remember out of my 10 last time, I think 3-4 just stopped growing by day 5. So we knew those wouldn't work or be able to freeze.
The transfer is just uncomfortable because of your full bladder. My clinic requires 30 minutes of lying still in that chair and then you can go pee. I didn't make it last time on my FET. I had to get a bed pan - man I had to pee so bad!!

But other than that it is cool to be able to see the little embies. My clinic says they have a new catheter with a better camera so you can see it alot clearer. Can't wait to see that!
Good luck with whatever you decide. I am sure the doctors know best!