I had a doctor like that who kept telling me when I was 37 weeks that I was over 4 cm dialated that I could sneeze and have the baby and wouldn't make it to my next appointment so we drove out of state to my in laws to have them watch our toddler, but then each week went by and I seemed to stay between 4 and 5 and just kept getting told I wouldn't make it to the next week, until finally at 2 days overdue with a 10 pound baby they finally induced me, I ended up not seeing my toddler for 3 1/2 weeks it was so frustraiting.
Hopefully your doctor doesn't let you stay that far dialated without helping your body in to labor if needed. i'm sending you quick labor vibes!