Yes, Google definitely can be evil. I was trying to research it for you last night, and I found so many differing opinions.
I did watch a conception to birth video from National Geographic the other day, and I think that's where I remember them saying the fertilized egg starts secreting something immediately, but I don't remember it being hCG. Last night I came across a few different sites that said the cells that will become the placenta begin secreting hCG at conception.
I'm glad to hear you've almost stopped bleeding. Lordwilling it was just a decidual bleed or a cyst on your ovary or something. Please keep us posted. Continuing to send prayers.