My second pregnancy I was carrying super low! Compared to my first..
I didn't need anything when I pre-registered. Just myself. Haha
Mine checked to see where I was at once prior to actually going into labor she waited until i hit 37 weeks. then did the membrane sweep at the same time. I have never Pre-registered maybe that is because our OB docs all work in a Pavillion and all have epic which is an electronic medical record they share with the hospital so they have access to all the records.
With my first they checked. With my second the midwife checked because she didn't a think I was far enough into labor to go to the hospital. And never checked again after that.
I beought my my insurance card and ID to preregistration with my first. I didn't preregistor with my second at all.