I don't know what's going on ...

Today I went to the hospital for blood work afterwards I left and I went home. About 3 hours later I received a call to come back to do an ultrasound. My doctor told me that my numbers was going down; which is a good thing. They are back down to 65 but we need them to be at zero. He also told me that the mass; which was thought to be a cyst is getting smaller, but he is not sure what it is. That kind of made me angry because at my last appointment it seem like he was positive that was what it was now he isn't sure. Now that's not even the crazy part. He also told me that when he did the D&C there was not evidence of a embryo. HUH? So he went on to say that that cyst could be a embryo. If you are confused so am I! My numbers are going down so clearly that mean no embryo is present. And he says the mass(if that's what it is) is getting smaller so I don't know what to think. He even started talking about the possibility of the mass actually being a embryo. So now he wants me to come back Monday to check my numbers. I don't think its an embryo though but I cant explain why there were any remnants of an embryo. I'm clueless!