Miscarriage?

Sarah
I got my first positive tests 3 weeks ago, I should be approx 6 1/2 weeks now. I have early scans due to many miscarriages. I had a scan on tuesday ( should have been about 6weeks), the baby only measured at 4 weeks. Which means if it is right I would have only been 1.5weeks pregnant when I found out, pretty sure that's impossible! When pregnant I am extremely sick, I was mildly sick for a week or so, for the past 3 days there has been absolutely nothing. Though I have no spotting or cramping either. I am due for my next scan on the 30th. They don't want to check blood as for some reason my hgc still rises even in a failing pregnancy.. Has anyone else had anything similar with a good outcome? It's so hard not to worry and think 'what will be will be' thanks in advance :) X