well doubling every 2-3 days is just a guide line. they are looking for at least 65% in 2-3 days. the only time mine actually doubled in that amount of time was with my miscarriage. Both other viable pregnancies, it only went up about 50% in 3 days...but yours arent even near that. I would ask for another test and see what happens. that should be very telling.
I'm sorry to be the one to say this...but going up only four points in three days isn't a good sign. It should double every 2-3 days. You need to talk to your doctor ASAP. I hope they made a mistake and the numbers are wrong...
Tricia
I had mine done 15 dpo and it was 1510, one at 19dpo and it was 8570 and the last one done at 21 dpo and it was 15,000. They are suppose to be going up, if not then there is something wrong. Did your doctor mention anything about it??