GDM. Diabetic in Preg.

Should I worry about my GDM? Doctor insist I meet a dietician as well as monitor sugar closely. He is scaring me with stillbirth. He kind of telling me that I may need to csect at and cannot wait to 40 weeks. I want to go for VBAC and he just crushed my hopes. I don’t even think my diebetic is very high as it’s 4.3 using the machine. His readings was via blood.. and it’s confusing to read and understand.