Im scheduled to get another ultrasound next week to see how the pregnancy progressed.
Try to hang in there hun, I know this waiting is SO hard! I also had an u/s at 6 weeks where all they saw was a gestational sac (no yolk sac or fetal pole) by around 7 weeks there was a yolk sac, fetal pole and heart beat!! I think there are even women on here that have had to wait till closer to 8 weeks to see anything. My Dr. was also on the negative side, I think they feel the need to prepare you for the worst. (((HUGS))) The fact that your levels almost tripled is great! Let us know how your next appt goes!
if u think she dosent check u well change doctor i knw it stress full going into all that. good luck.