Help. Heartbroken. Miscarriage?

Megan
Last Sunday my hcg levels were 10,500, wed it was 18,000 today Monday its 27,000. Ultra sound didn't show baby or heartbeat on Saturday and I'm 7 weeks. My doctor said my baby has a slim chance to make it. I can get a dnc or let it naturally happen or go for two more beta tests and anoth ultrasound. Any personal stories or input?