Contraception and abortion have been around a lot longer than people think; sex without pregnancy can be arranged. The deeper issue, in my mind, is whether it's acceptable in a given society for a woman to make the choice not to have children. Medieval nuns were allowed to; outside of a convent, not so much. You need lots of children in that time period to get a decent number of surviving adults, and if a guy goes through three wives because they keep dying in childbirth, your odds of escaping marriage aren't good.