Earliest sono

When is the earliest you can usually have your first sonogram? I have an appointment next Wednesday when I will be 8 weeks and 5 days, but have completely lost all symptoms I previously had. It’s worrying me because the last time I had a miscarriage the same thing happened. It just so happened that the symptoms went away two days before my appointment last time so I didn’t have to wait as long! I was hoping I could call and get my appointment moved up to sometime this week but wasn’t sure if the sono would be able to tell much this early?