Vic, I'm sorry to hear that you're so worried ATM! I'm sure there is no reason for concern.

HCG is what the pregnancy tests detect - so when you get a positive HPT, it's because it has detected HCG in your urine. To find out exactly what your levels are requires a beta HCG blood test. One blood test on it's own really doesn't tell you much though - you need serial testing in order to see a rising trend, which is a good indication that things are going as they should. Mind you, your HCG levels can still rise and there be problems with the PG, but that's beyond the scope of your question and not a common situation in any event. It's for this reason, that u/s are a much better indication as to the progress of a PG, but in the very first few weeks of PG, HCG testing can help set your mind at ease some.

It's not normal to have HCG testing done however. I have only been having it done as I have a history of m/c and therefore find that I need that extra reassurance.