Okay please don’t judge me cause I’m not smart when it comes to this stuff but I am currently 28 weeks and 5 days pregnant according to my obgyn. My obgyn says my due date is October 4th 2019. BUT it just doesn’t make sense because I thought you were supposed to be measured by the first day of your last period. Well my first day of my last period was on December 18th 2018 and my cycles are really irregular but I’d say on average they are 31-32 days. So that would put my due date to September 27th or 28th. All the due date calculators tell me I’m due on the 27th/28th. I probably sound stupid but I honestly just don’t get it lol.