I agree w/ Laura. They are rising, so I don't know what they are talking about either. I will PM you a website I found for another poster on here that was having the same problem only hers was very high and she thought she might be having a molar pregnancy. She is now 39 weeks pregnant and will delivery at anytime!!
I think as long as they are doubling, you have reason to be "cautiously" optimistic!
Please keep us posted and try (I know, impossible!) to relax. Stress isnt good for you or the baby! = )
Good Luck!