Scans that early are generally just to date the pregnancy. The earlier the scan, the more precise they can be about the age of the embryo. Many people also find it reassuring to see a heartbeat. It makes it seem much more real. The baby is much too tiny to tell anything else worthwhile.
For me it caused more trouble than it was worth... I was out by 2 weeks on my dates and they couldn't find a heartbeat. Everuthing was fine, just too early to find the heart, but it caused me a lot of stress.

I would say wait until your 12 week scan unless you are concerned about the pregnancy. 12 week scans are accurate enough for dates.