If I was the heroine in an apocalypse movie the human species would die out.
#1. I'm not repopulating the earth with just any old guy who survived like a cockroach.
#2. No way I'm going back to the bad old days of child birth when women died all the time and there was no such thing as an epidural.
Instead I'd try to breed smart animals like Dolphins, Elephants, and pigs in hopes that one of them would become the dominant species. I'm rooting for the Elephants. I don't know why.