They should be looking at a multitude of things to determine pregnancy
I don't want to give you false hope because you are very early in the pregnancy
. I would try not to stress though on the ectopic. Based on the charts and the fact you are doubling, you do sound ok.
Good luck and please let us know how things come out.
Below is the chart for you to look at.
At 14 DPO, the average HCG level is 48 mIU/ml, with a typical range of 17-119 mIU/ml.