Confused about when i concieved

De
I thought i was 6 weeks based on the first time we did BD after my lmp, but my first US measured baby at 8 weeks. How is it possible because i was on my period during that time and we did not do anything? I asked my doctor and she just basically said the US is the best for dating due date. I am happy im furthur along but so confused as to how? 

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