The Collaborative International Dictionary of English v.0.48:

Pregnancy \Preg"nan*cy\, n.
   1. The condition of being pregnant; the state of being with
      young.
      [1913 Webster]

   2. Figuratively: The quality of being heavy with important
      contents, issue, significance, etc.; unusual consequence
      or capacity; fertility. --Fuller.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "pregnancy":
   abundance, appropriateness, auspiciousness, babyhood, beginnings,
   bigness, birth, bountifulness, brooding, chargedness, childhood,
   convenience, copiousness, covering, cradle, criticality,
   crucialness, expedience, expressiveness, exuberance, favorableness,
   fecundity, felicitousness, fertility, fitness, fittingness,
   freshman year, fructiferousness, fruitfulness, generousness,
   genesis, gestation, gravidity, gravidness, greatness, heaviness,
   inception, inchoation, incipience, incipiency, incubation,
   incunabula, infancy, intelligibility, interpretability, loadedness,
   lushness, luxuriance, meaningfulness, meatiness, meetness,
   nascence, nascency, nativity, opportuneness, origin, origination,
   parturition, pithiness, plenteousness, plentifulness,
   procreativeness, productive capacity, productiveness, productivity,
   prolificacy, propitiousness, propriety, readability, richness,
   rightness, ripeness, seasonableness, sententiousness, significance,
   significancy, significantness, sitting, situation, suggestiveness,
   suitability, superabundance, swarmingness, teeming womb,
   teemingness, the family way, timeliness, youth