Pregnancy- Ask Dr. Mona

Question for Dr Mona:
Ok I’m going to describe my situation as best I can:
Well on Feb. 16th 2009 I found out I was pregnant. So I have been going to the OB-GYN for checkups once a week to make sure I’m on track.
The doctor I go to is just a quack!!! Usually with an ultra sound they are supposed to be able to tell how far along a woman is or by the HCG readings and also by last menstrual period. They haven’t been able to give me an estimate of how far along I am what so ever.
For the past couple weeks I keep getting told I’m about 4 weeks. How can I be 4 weeks for 2 weeks in a row??
Any ways...on my last ultrasound the yolk sac finally showed up in the gestational sac. But there is still no embryo or fetal pole. And they right away told me it’s highly most likely a miscarriage. And last time I had my quants checked they were 2,844. Now today’s results were in the 16,000's.
Could it be that I’m just too early to see any of what they expect to see?? Or could I really be miscarrying??? Please advice?? I’m really scared...this is my first pregnancy..

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