Sept 7th I got my bfp after 3 years of trying!!! Since Sept 13th my hcg has been monitored. On average, I am rising 41% every 3 days. Today I am 4573. Today I also had my 3rd us. Still no visible sac can or anything. Endometrium is nice and thick, and clear fallopian tubes. I'm not cramping or bleeding. My body is going through all the expected pregnancy signs. I'm so confused and scared. Dr is calling me the mystery patient. Not only are my numbers not doubling, but they can't see the little bugger either ..... Anyone else have similar issues..... What was outcome. ...