[oh8eleven]

approximately 2/3 to 3/4 of pregnancies do not result in a live birth.
Whoa, those numbers sound very high. Source?

[null and void]

Correct. In recognized natural pregnancies it's closer to 20%, the figures I got were for IVF pregnancies.

Poor, hasty research on my part.

Good catch on yours.

I suppose I could still argue higher than 20% as that is for recognized pregnancies, and there is no way of guessing how many unrecognized ones spontaneously end, but ya know what? I'm already in a hole.

I think I'll stop digging...