First appointment

Who has had their first appointment yet? I know they go by your first day of your LMP and look at your ultrasound to see how far along you are. According to my LMP I’m a little over 7 weeks. My best friend is calculated to be 1 week ahead of me according to her LMP and she had her first appointment today and they said she is 7weeks 3 days. I’m worried that I’m prob only 6 weeks not 7... my symptoms are so intense now.... the nausea is unreal and needing to eat all the time, heartburn, bloating etc. I’m just nervous that next Friday when I go in they will tell me I’m not as far along as I think!