We are tell--to most people--but it never came up in any context while I was at the hosptial. My OB knew, but as far as I know didn't bring it up or have it in my charts in any way.
On a slightly different note, though, I wasn't prepared for all the nurses asking about who the baby looked like--where she got her long fingers from,etc. Kind of took me off guard because I wasn't ready to share about DE with total strangers.
Best of luck and try to stop worrying! You're going to have a baby soon!!