When I had my first BT done I think i was about 12DPO & when the results came back they were only something like 135 & the doctor told me I was "only JUST pregnant". Maybe you had the test early like me & the numbers were abit low. I went on to have a healthy baby boy so low numbers to start with doesnt mean anything bad (unless of course they're "too" low, meaning a negative result)
Good luck next week. Can you ask them what your HCG levels were? That way you can compare to the next results & hopefully see a nice rise in the levels....