If your levels are doubling every 48 hours, you would have had a level of around 10 eleven days ago. Those ultra-sensitive FRER can pick up HCG at 10 or less per some reports. So it's possible that you are doubling just fine. I would wait to see what your next level is. Cramping is normal.
Agreed. My first level was 11.6. My #'s have been rising as they should and I am also waiting to hear this morning about my bloodwork from yesterday (my last round of bw if the #'s are good).
Hoping you get good news today!