Ectopic pregnancy?

Are there any ladies who have had an ectopic pregnancy who wouldn't mind sharing their symptoms or input to my situation?

From my last period I'm supposed to be 6w 3 days pregnant as of now. When I found out I was fine for a few days and then had bleeding which has been for a little over a week now. Started light then heavy (clots included) now I'm barely spotting. No cramps either btw. All of last week I had two ultrasounds that showed nothing in tubes or uterus. And my HCG did show a double rise from the two days they were taken.. I had figured I was miscarrying but since I got my results back from the HCG rise I'm not sure what to think.

So now Sunday I have another ultrasound and possibly blood work. I'm just scared this baby is ectopic and I really don't want something bad to happen to me if it's not caught soon enough. Lastly, I took another pregnancy test yesterday and the line was darker then the day I first tested. I'm just so baffled and I'm praying they can find the baby Sunday.