J.☯.
I'm a little confused. In your other post you said there is no heartbeat. That tells me that you went to your OB and he/she could not find a heartbeat. Otherwise, why would you mention the heartbeat?
Also, you say you are 9 weeks along but you really think you are 7-8 weeks along. An ultrasound would give your OB fairly accurate information to give you a due date and tell you how far along you really are. When I was pregnant with my second, the due date I had in mind was based on the first day of my last period, just like the doctor tells you at first. Based on my u/s the due date changed. My OB explained that I ovulated late that month. It happens all the time.
You really need to talk to your doctor about your concerns. There are simply too many factors. Your OB will have all the information and be able to give you good, accurate answers.
I'm surprised you left your doctor's office without asking whether or not you had a viable pregnancy.