I don't want to give you any bad news, but I've had 3 ectopics. My numbers rose in 2 of them. The level got as high as 8000 in one of the pregnancies. I didn't always have symptoms and when I did they were mild. Please be very careful, as this can be a life threatening situation.
Sometimes your levels can be higher then usual, but that's if you are pregnant with multiple births. Unfortunately, I think they should be able to see a sac or multiple sacs by now, but I could be wrong.