have one in the oven
To be pregnant. You're having a baby shower for Carla today? Wow, I didn't even know she had one in the oven. Yes, I have one in the oven, but please don't tell anyone—I'm still only in my first trimester. A: "Oh my gosh, you guys have one in the oven again?" B: "Yep, and when she gets here, we'll have four kids under the age of four, which is only a bit terrifying to consider!"
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