I started the zero carb lifestyle 3 weeks ago, and just recently found out that I conceived right around that time. I feel so much healthier with no carbs, and I intend to stay that way. So far I have had only the tiniest hints of morning sickness.
I don't believe any of the hype around ketosis in pregnancy, in fact I believe it to be a completely natural human state. However, I respect other people's choices about that.