I tested positive 9 days post ovulation. On the day of my expected period, I did a blood test and got 82 miu/ml, I was scheduled for a second test because of my previous miscarriages, I went in for my second blood test, and my beta HCG was 128 miu/ml. There was a 48 hour gap between both tests. I was told my hcg should double, however it hasnt, its rising but hasnt doubled. Should I be worried? Should I go in for another round of blood test?