Join Date: Nov 2005
Location: Very Far Away From Anywhere Else
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My best guess -- and this is a great question, by the way; oddly, in all of my ponderings on the wonders of conception over the last twenty years, I've never thought about this!
I don't believe the uterus has an air pocket, so to speak. I believe that the walls touch or nearly so, unless a woman is pregnant, and then it expands to accommodate the baby. It is mucous-y, yes.
: I am a woman of faith; a mother; a writer. :