I did shared care with the middies but it wasn't until 20 weeks onwards. They def did do a detailed health screen (not sure of the term) with me which included whether I smoked, drank, did drugs etc. My Ob also discussed A&OD with me from the beginning. When I said to the MW's I didn't drink or smoke they were pleased so clearly felt zero consumption was best. But it seems different women have different experiences.
I also wonder if some women aren't truthful for fear of stigma.