Unfortunatly if you have a decline in HCG it usually means a non viable pregnancy, HCG doubles at a rate of 48-72hrs in early pregnancy. But having said that miracles do occur!! Crossing my fingers your one of them.
Please keep us informed and you are in my thoughts.
I hope your next hgc levels double. They should double every 48hrs. If they don't, it's not usually a good sign. It's usually not a good sign if they drop. I'm sorry.