I've spoken with my doctor and the plan for now is to monitor my HcG levels for the week. She said they should be doubling every 48 hours, but even if its not doubling exactly but even just going up we will be happy. She sounded somewhat optimistic, saying that at least the pregnancy is progressing, as at least today there was an embryo with a heart beat. She said she's seen two other cases like this: in one the person miscarried but in the other it turned out OK. So I guess we will have to wait and see. Should know by the end of the week whether the numbers are going up or down. In the meantime I will be staying home from work and taking it easy.
I've done much reading on the subject and from what I can tell, my chances are slim to none. Here is a website where several other people have been in my same situation. If you have some time to read it's interesting stuff.