HCG levels high?

Danielle • I have a 6 year old son and am pregnant with baby number 3! I had a miscarriage and am now 36 weeks!
I went to the ER on October 12th and they did an ultrasound and they measured a 5 1/2 week sac but couldn't see a baby yet and my HCG was at 15,000. I went again today for stomach cramps on October 29th and they couldn't get me in for an ultrasound until tomorrow sometime but my HCG was 170,000 today and I would be around 8 1/2 weeks Wednesday which seems considerably high to me:/ I am so worried about a molar pregnancy, anyone else have this high of levels and everything turn out good?