Low HCG

First beta was 129 at 4 weeks 6 days - nothing seen on u/s just thickening of uterus. 2 days later was told it was 38 and would most likely miscarry. It's been 5 days since and I'm still testing positive, my symptoms are increasing - sore boobs, food aversion- and my cervix is still high and closed. I'm not cramping or having any spotting or bleeding. What gives? Don't go back to the Dr. for another 5 days. Any hope? Worry or don't worry?