Due date confusion

When i went to the doctor back June i went in at 7 weeks according to my lmp and my due date is 2/8/19. They did and ultrasound and i was told I’m measuring 7 weeks 4 days but my due date is the same. That’s where I’m confused at. Today I’m either 9 weeks or 10 weeks 4 days but i have the same due date regardless which doesn’t make sense. Wouldn’t the date be 4 days sooner? Then i was given and ultrasound but no pictures so my feelings are hurt. The hospital I’ve been going to is lousy and i have to sign in online to even check any of my info because they don’t tell me anything while I’m there 😕