Chinese calendar and gender

I was fooling around on the computer and decided to look at the Chinese calendar, just for fun. We are the sex of the baby. When it says "Month of Conception" do I enter the first day of my last AF or the month we actually conceived? The first date of my last AF was November 29th, but we conceived in December. Which one?

Re: Chinese calendar and gender

I think it would be december, the month you concieved. I did that, it says a so we'll see!