You medical history sounds like mine.
My mw said during the birth of my 2nd that my skin looked friable and the consultant did say (but too late as was in advanced pg by then) that maybe they should have sent me to a proctologist.
From everything I've read this is good practice, as more should be doing this. It's to assess how thin and friable the wall is between vagina and back passage, particularly if it is to prevent future incontinence, not just immediately after childbirth but in your later years where women later find it is a problem.