Jess - at kkh, you will go back for ET 2 days after ER. However, if dr feels you satisfy the criteria to wait for day 3/5 blastocyst, she'll inform you in the room. That's what happened to me two days ago.
ER hubby cannot company you but ET ok. Rest for about two hours after ER. I don't have any support after ER , not sure if it's normal though. *shrug*