LMP vs GA? What to go with?

Siobhan
So I have a question. I went in for my first ultrasound this past Thursday and the baby measured 11w5d, which was four days ahead of my LMP and the doctors calculations. (11w1d) 
Do you base how far along you are according to the baby, or your LMP? I am more inclined to go with the baby- especially since i will be 12 weeks today vs. 11w3d.
Thanks! 

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