To be very honest if your goal is ultimately to have kids than you do want to eat plant and animal products cause your baby needs it!

You can't be vegan trying to have a baby cause that will ruin your baby, low development, low birth weight and the like. You need animal and plant products during pregnancy and then you can be vegan. I and women who aren't wanting kids can eat whatever we want to and even eat no meat or animal products if we feel like it. You can not do that if you want a child cause you might ruin that child forever.