First Time Mom's / Moms With A Kid Already

I'm curious , did your first baby come exactly on it's due date , a week after or before ? Some people believe that your first baby always comes out sooner and others say your first baby comes out later ? I calculated my due date to be around march 19 or so but my obgyn says my due date is april 22 nd , & i'm 29 weeks already my mom and boyfriends mom say that I might have my baby earlier . 
comments are welcomed !! :) 

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