have a bun in the oven vs up the stump

have a bun in the oven

verb

  • To be pregnant; to be expecting a baby. 

up the stump

prep

  • At a loss, puzzled, in a bind. 

  • Pregnant. 

How often have the words have a bun in the oven and up the stump occurred in a corpus of books? (source: Google Ngram Viewer )