Sorry, I have to indulge in a bit of sarcasm here...
You to him: do you think I can make this baby by myself? As far as I know that only happened once.
You to him: if you really want a baby, YOU are going to have to make the sex happen. I will show you the calendar, and then it's up to you.
Sorry... I had to get that out of my system. I'm probably projecting my irritation at my bf (not about babies, but just stuff in general). <Lil retires to the kitchen to make low carb flax seed muffins...>