I had one without ultrasound which made DD. then I moved to a new clinic which used ultrasound and got a BFN on my first transfer (perfect blastie), the second transfer took though.
At my new clinic you have a chat with the embryologist before transfer about how the embryos look. It's helpful, but like others have said a perfect embryo goes not necessarily make a baby. No does a bad quality embryo mean a BFN. The embryologist I spoke to said they change hourly, what was perfect and change very quickly both in the dish and in your uterus. Likewise a bad one can come good just as quick.