Kim I really know what you mean.

With DD1, I had really really low progesterone, to the point where the printout said that the pregnancy was doomed but may recover. Huh? How incredibly stressful and I was worried sick til the 12 week scan. Far later on I realised that this was still within the normal bounds. But those 8ish weeks were just crud.

I feel like the next pregnancy has the best chance of success if I minimise stress and that means NOT getting HCG but waiting til the first scan.

Phew, glad to hear I am not alone in this!