DH and I discussed whether or not he could be there for ET #2, (luckily he was there for the 1st one). He was ultimately able to be there based on when it occurred, but we had decided that if he couldn't make it, he would at least "participate" in the embryo quality/how many to transfer discussion by phone.
That, to me, was the most important part, and that he participate in that discussion. So, perhaps DH can make himself available to talk with you and the RE on the day of ET, especially since you'll have a pretty small window during which that talk will have to take place.