Bun in the Oven

Yesterday I began to actually "feel" pregnant. Not meaning I haven't suffered from other symptoms of pregnancy (boy have I!), but I finally felt that that there's something in my belly. All it feels like is a lump of dough: a heavy, round and prominent lump of dough that's very sensitive to pressure. Huh! Lump of dough = bun in the oven??

So, I searched the origin of the phrase "bun in the oven" and found this:
The Random House Historical Dictionary of American Slang notes that the word "oven" has been used to mean "vagina" or "womb" since the end of the 17th century. And the late scholar Beryl Rowland has described the expression as "a colloquial use of an ancient folk metaphor" with roots in classical times. In an article in the journal American Speech, she wrote: "The ancient gods such as Zeus were conceived as millers and their consorts as mills; the human race was the product they ground and baked, and on a terrestrial scale, man and woman performed similar functions."