12/18: Your dates don't exactly match up. If you are 13w and 6 days today, then you conceived around 12/18. Based on you LMP of 11/22, then you conceived on 12/6. The more accurate of these 2 dates would likely be the 13w6d, and thus the conception date around 12/18. When ultrasound date and LMP date are off by > 6 days in 1st trimester, doctor will use ultrasound date. Hope that helps!
Answered 2/13/2015
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