My last period was September 20th, 2010. I took a positive pregnancy test on October 25, followed by a positive blood test on the 27th. By my calculations I would have been 5 1/2 weeks pregnant, but my Dr. said I was 2 weeks. How can this be? Don't you calculate how far along you are based on the first day day of your last period? My Dr. never even asked me this question. Can you even be 2 weeks pregnant?

If your LMP was September 20, you are currently 5 weeks and 5 days pregnant as of today, November 1, 2010. Your due date is June 25, 2011.