I think we are seeing huge changes in human fertility. Realistically, assuming a woman has sex on or around her ovulation date, she should get pregnant. But more and more, it's taking at least 3 months to conceive, and that's just for healthy women with no identifiable problems. Doctors won't even talk to you these days until you've been trying for 12 months, because it's common for it to take that long these days. And what about the high levels of miscarriage and stillbirth?