What do you tell children about having babies and marriage? (Read below)

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I'm a school teacher and it's obvious by your title whether you are married or not and I've recently had a lot of students ask me if I'm married (I am not) or how I'm pregnant out of wedlock (ah innocence 😛). I know we're told as we grow up that marriage is first so I wanted some opinions on what I could respond? As a parent what would you be ok with, or what would you not be ok with? (K-Gr.6)

My response has been "I'm getting married I just don't fit into my dress with baby in there!"

(Honestly don't know what room this goes in)