Probably asking for due date and maybe they are asking for your birth plan requests. So delayed cord clamping, dad cuts cord, etc.
I registered when I was 30 weeks, my doctor told me that if I was confused that I could call the hospital and tell them I wanted to register for birth and it would probably be easier that way and it was!
I registered at 17 weeks but the only reason why I did it so early is because my ob required it at the time. I don’t remember those detailed questions though.
Without seeing the form it's hard to say but I'm going to guess it's wanting your due date.