conception vs speculative fiction

conception

noun
  • The act of conceiving. 

  • An image, idea, or notion formed in the mind; a concept, plan or design. 

  • The power or faculty of apprehending of forming an idea in the mind; the power of recalling a past sensation or perception; the ability to form mental abstractions. 

  • The fertilization of an ovum by a sperm to form a zygote. 

  • The state of being conceived; the beginning. 

  • The start of pregnancy. 

  • The formation of a conceptus or an implanted embryo. 

speculative fiction

noun
  • A particular work belonging to this class. 

  • A class of fiction involving fantastic, supernatural or futuristic elements, including fantasy, horror, and science fiction, dealing with worlds, themes, and characters not part of everyday life. 

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