Hi babyjo - I'm sorry you're going through all this worry. I'm in a similar position, trying to stay hopeful but also trying to prepare for the worse.

To get an idea of HCG, you may want to get a second test before your scan - it's the doubling rate that mattters, rather than a single number. You can also look up Beta Base to see where you fit (though try not to google too much, it'll do your head in)

With the 2nd test, get them to measure progesterone. This can often be as much of an indicator of pregnancy viability as hcg. EG, my hcg is very good, but progesterone is very low, indicating things may not be going well. Personally, I avoid scans where I can and go by blood test results (can't bear scans after having a mc)

GL