If your DH is that tall, then genetically it is possible to have a large baby because of that and the GD isn't a factor. The measurements that they also use to calculate babies weight in utero is their femur measurement, so for all you know, you could have a really long, 8lb baby kwim? I don't think you need to be ringing alarm bells yet, but it is information that you take in anyway. How do you feel about having a vaginal birth for a 'big' baby? Do you think that even with the knowledge that your baby could be large, that you would still want a vb anyway? Again bearing in mind that you could agree to a c/s only to have a small/average size baby and how would you feel about that? I don't think that there should be any undue pressure on you for a c/s unless there is a medical reason for one, but it is something you should prepare yourself for jic and have a think about how you would feel about all these things.