Ok so if u had it thanksgiving that means your mist fertial days would be dec 7th - dec-13 which means you are most likely to concive around dec 11th so your possiable due date would be sept 13 2013 and you would be 9 weeks 7 days still in the first trimestet..
Probably got preg early to mid dec then so probably due mid sept
I would call your doctor only they xan say for sure