IF you are past 7 weeks the chance of Ectopic is very low, they happen between 6+7 weeks. I had one at 6+4 in 2007.
I had an early scan today at 5+6 to check mine was in the righ place, and they saw the pregnancy sac with a yolk sac in, No HYB but this is normal. When i was PG with with my 9month old i had a scan at 6+6 and saw HB and baby. so you should definately see something positive even if they scanned you tomorrow!
Good luck x