I would wait on the d&c if you have ANY Doubts. However, declining hcg levels are always a bad sign. I don't know if I've ever heard of them actually declining and having a positive outcome, i.e., a baby. I'm sorry, hun. This is very difficult to go through. I agree with the previous poster, I would have another u/s and bloodwork in a week, see what happens. There is no rush to do a d&c. Good luck!
i've never had this problem but if your not sure it won't hurt to wait another week to have your hcg levels checked and to get another ultrasound good luck