Hi I would like to know how accurate the transv u/s. Based on my LMP I am 9weeks and 3 days now (Nov.23), but when I got my u/s yesterday (Nov.22) it is 10 weeks and 6 days. How does it happen that I've got pregnant even I got my period 2 weeks later? It means It was Sept.7 since I got pregnant but I had my period last Sept.17. Do they only based the weeks thru the measurement?