Anyone elese

Ok I'm a bit confused because my due date is off my 3 days 😑 so my lmp was September 2nd 2019 its estimating my due date to be jun 8th 2020 and saying I conceived on September 15 but it's wrong I only had sex one time in September an that was the 19th I remember so shouldnt my due date be jun 11th 2020 ?? Help this is annoying me because this is wrong I keep telling my doctor this but there going off my last period had this happen to anyone

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