1st visit

I was so excited my stomach was hurting. this is the first ultrasound a little uncomfortable but worth it. This is a repost everyone in the other group was bring me down act like they couldn't read when I said my doctor probably made a mistake and say due date aug 15. But I know im due nov 15. I was to excited to correct and make sure I want having a baby 3months early. Ill just have to hold and let the bun cook a lil more lol. But again my ex bestfriend had her baby at 7 months and that was her due date giving..... Is it possible? Can a doctor tell this early?