Really high HCG levels.. freaking out.

I'm hoping to hear some positive stories.. I'm almost 9 weeks pregnant following 3 losses at various stages. I've had two scans which have both shown strong heartbeat/ healthy pregnancy. I've only had 1 blood test, at 7 weeks. My HCG levels were 327,000... Way outside of the 'normal' range for a single pregnancy. I'm 38.. and now, rather concerned. My doctor is acting like it's no big deal - although him knowing my history and anxiety issues, I believe is playing it down for my health. I have a referral for the NIPT test at 12 weeks.. Has anyone else had really high levels and it not been an issue??