WOW! You were 12 1/2 pounds??? I just couldn't imagine!! I don't think you will have a six pounder but you never know...trying to give you some hope.
My husband is 6'6 and around 200 (I think - he is actually a pretty thin guy). His brother and he did weigh over 10 pounds at birth. Both of my brothers weighed over 10 pounds as well. My mother's sister also delivered 10 pound babies...pretty much everyone in our family delivers pretty big babies.
I was a little over a month premature and I weighed a mere 5 pounds, 5 ounces. I probably would never have gotten 10 pounds but there are other possible reasons outside of genetics why that may be.
Anyways, my little man Nathan was a week late and weighed 7 pounds, 7 ounces.
You may get lucky. I don't know....I still can't believe you were 12 pounds!!