When she gets within 2-3 weeks you'll be able to feel the babies actually moving and not just her stomach. The week before they're born you can sometimes hear them tooth chattering in utero.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry