I realise 3BC and 4BC embryo grades are poor but I feel sick about them being discarded tomorrow if they don't somehow improve, because I didn't get many in total (just one other - a 5AB). Apparently the clinic would maybe transfer if a fresh cycle but don't want to freeze.
What is the policy at your clinic? I've seen success with this grade searching online, which is very distressing. However low the chance might be after thawing it's going to be more than zero.