Anyone familiar with fresh transfers?

Not yet moving to <a href="https://glowing.com/glow-fertility-program">IVF</a> but my doctor is seriously considering that route due to what she thinks may be delicate embryos. She said sometimes the uterus is a better place than a Petri dish when things are more fragile 🤷🏼‍♀️

Do you know what happens to ones you don’t use? Do they freeze right away? Do they grow those out and then freeze?

I know they seem to recommend only transferring 1 embryo if PGS testing is done. If you’re doing an earlier fresh transfer does it make sense to transfer 2 or does it not work like that?