Its possible you ovulated later. In the first 13 weeks of pregnancy ultrasounds are the most accurate for dating.
Thanks for your comment, Im kind of worried becasue the first day of my last period was november28, 2010 and according to the due date calculator im due september 4th, 2011. However according to my DR im due october 3rd, 2011... a whole month later! I am still currently working and planned on working until the week before im due but now Im confused as to when exactly I'am due! I have a co-worker who is pregnant as well and our due dates are a week apart she's due a week after me but she had her LMP in december 2010 and didnt find out she was pregnant until the beginning of feb. I found out in the beginning of jan. that I was expecting... Is it possible my DR is a complete idiot and Im really due in sept.? I questioned him on this once I realized the discrepancy and he said he was going by my sonogram I had in march and that I am positively due in oct.? Is this possible?
i doubt it unless u got pregnant after you missed you period
Well with my son my last period started was Jan. 12 2005. According to the calendar thing I should have been due Oct 17th 2005. BUT my DR gave me a due date of Nov. 2nd 2005( I might have ovulated late) BUT I had my son Oct. 15th. So by looking at what I just wrote, probably not.