antepartum vs in utero

antepartum

adj

  • Describing the period before childbirth; antenatal 

in utero

adj

  • Occurring or residing within the uterus or womb. 

adv

  • Occurring or residing within the uterus or womb. 

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