20 week scan baby at 13 oz

Okay so my question is, is it normal for my baby to be 13 oz already? My due date was pushed forward two days and the app said my baby should be 10 oz at 20 weeks I WILL ask my doctor but I didn't see him the same day as my scan I see him in 2 weeks. Could my baby be 13 oz because gestational diabetes ? Also I know It could still be Normal and still have it I just don't know how to word it

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