No. This should not concern you at all. Obviously, you want to be watchful over her, but let nature take its course and understand that a due 'date' is not set in stone. Good luck!
I'm guessing this is an old question but I wouldn't worry because pregnancies carrying late are common and normal. It happens every day with human women and there is no reason it shouldn't happen to dogs and other animals as well. It would be best simply to be patient right now.
