impregnate vs preggy

impregnate

verb
  • To saturate, or infuse. 

  • To fill pores or spaces with a substance. 

  • To fertilize. 

  • To cause to become pregnant. 

preggy

adj
  • Pregnant (carrying a baby). 

How often have the words impregnate and preggy occurred in a corpus of books? (source: Google Ngram Viewer )