Should I go?

I went to the dr today and got my first ultrasound at 6 weeks, unfortunately the sac wasn’t showing a baby. Everything was in place but no baby! The dr wants me to go in at 8 weeks but I’m so scared because I had an ectopic last year! I want to change my appointment for 7 weeks which would be next week. Would it still be too early to see anything? Should I just wait till 8 weeks? I’m going crazy 😭