Due dates

I conceived on October 23,2015 and I started with a due date of July 12 but at my anatomy scan they changed it to July 4... I'm so confused.. Is this normal?? Is it because my baby girl is measuring a week and a half bigger like they told me?? Why would they change it? FTM hehe.. 
I also know that is when I conceived because it's the only time my SO and I had sex that month due to us not being in the same state that month..

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