Ultrasounds giving different dates..which one?

Morgan

I had a dating scan which put my due date as Nov. 19. I was 7w2d (couple weeks ago) Then yesterday I had another scan...abdominal. the tech measured 3 times and baby was supposed to be 10w5d and was measuring 11w1d. Should I be going by 10w6 days today with due date of Nov 19 or 11w 2d with a due date of Nov. 16?

Thanks for your input...im so wishing i can get those 3 days ahead....but I understand if it's better to just stick with the first.