My baby

Health Department told me last week that I was 7 weeks according to the date of my last period. But when I went to the ER I had a transvaginal ultrasound and I was told that they couldn't see anything but if I made an appointment to the OB they could tell exactly how many weeks I was. My ultrasound says at that time I was 5w 2d. But the nurse who had done my ultrasound said not to go by that date because that two was what the computer calculated as my last period. What should I think? Wait until my appointment with the OB (tomorrow) ? (Photo Below)