Concerning your entry on Jan. 26, I can tell you what might be happening. You probably figured it out, but I'll give it anyway. (I am an RN, by the way.) HCG is a hormone that is normally produced by women just after a fertilized egg has implanted in the lining of the uterus. Its job is to keep the endometrial lining intact until the placenta can produce enough estrogen to take over, then hCG production tapers off.