Michelle, i did the hcg calculator for you to see what is really happening and to me it looks perfectly fine. Your 2 day change is 96.30% increase, based on the study (below) beta hCG level for a successful intrauterine pregnancy should be expected to increase by at least 35% in two days. I understand the worry though, once you got to see your sticky bean it will change.
https://i61.tinypic.com/2afap6p.jpg
"Beta hCG levels usually double about every 2 days for the first four weeks of pregnancy. As pregnancy progresses the doubling time becomes longer. By 6 to 7 weeks beta hCG levels may take as long as 3 1/2 days to double . hCG normally reaches a peak level at about 8 to 10 weeks and then declines for the remainder of the pregnancy.
Morse and coworkers (2012) at University of Pennsylvania School of Medicine recommend that the beta hCG level for a successful intrauterine pregnancy should be expected to increase by at least 35% in two days. A slower rate of increase suggests a possible miscarriage or ectopic pregnancy. For women who are having a miscarriage the beta hCG should be expected to fall 36 - 47% over two days. A fall that is slower than this is suggestive of an ectopic pregnancy.
About 21% of ectopic pregnancies (pregnancies implanted outside of the uterus) have a rise in hCG similar to an intrauterine pregnancy and 8% of ectopic pregnancies have a fall in hCG similar to a miscarriage.
Serial hCG values should not be used alone to determine whether or not a pregnancy is likely to be a successful intrauterine pregnancy, a miscarriage, or an ectopic pregnancy. Serial hCG values should be used in combination with clinical judgment, evaluation of symptoms and repeat ultrasound (as needed)."