I agree with Lisa. If they saw a sac in your uterus, its not etopic (unless I guess its a twin situation). From what I know of etopic, Dr.'s don't mess around with it, and if he thought it was etopic, I am sure he would of said something. The reason they didn't see anything could be for a variety of reasons...could your dates be off? At this stage you could be right on the border of when they see a heartbeat, and it may still be too early. If your HCG's are increasing, thats a good sign. I wouldn't rush into anything either. I wish you luck. I too have had multiple miscarriages and I understand your fear. Please keep us posted, and I wish you all the best!!!
If they saw a gestational sack, was it in your uterus? If so then I dont think you should rush into any thing.
Some of the ladies on here mention that you do not always see a heartbeat or fetal pole at 6 weeks and your numbers are doubling even if it is on the slow side.
Lets see what other have to say on this subject.
Be patient
Lisa