Being pregnant is a binary state. Pregnancy is a process.

Of course. The point still stands - a person either is, or is not, in state of pregnancy.

I think that, from context, it was clear I was using "pregnancy" to mean "the state of being pregnant" and not referring to the nine month gestation period.

That'll teach me to contribute to pedantry-focussed subthreads. :-)

Pretty much nothing is binary. Pregnancy is only approximately binary. Whether you're right or wrong about it certainly isn't. And nobody uses language in a binary manner.