In general, the data you provided (6 weeks pregnant-confirmed with ultrasound scan, bad period like cramps, HCG levels going from 389 on 08/24 to 4921 as of 09/15), does not indicate a miscarriage. Many women experience period-like cramps, although they might be a sign of a miscarriage especially if accompanied with bleeding.
As a matter of fact, bleeding is the symptom that the gynaecologists are most afraid of. Every bleeding (light or heavy and even spotting) is considered risky for the pregnancy until proven otherwise. Women that experience bleeding should immediately visit a gynecologist or at least emergency medical service.
You might want to visit a gynecologist to consult about your condition (especially if the cramps are severe) and to find out more about the signs and symptoms of miscarriages.
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