Pregnation

Pregnation. Being great with childe.[…]a being great with Childe. Pregnation, Grauidation.

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But purging is more proper if it may bee done without danger, as it may in the fourth, fift and ſixt month of pregnation: for a child in the wombe is compared to an Apple on the tree.

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And that it may plainly appear, that the water (which is ſo plenteous in the Conception) is no excrement diſcharged by the Embryo, as either his Sweat, or Urine; it is leſſe (in proportion) neer the birth (when the fœtus is now more grown, and upon that account doth accumulate more excrement, becauſe he requires more nouriſhment) then in the firſt moneths of pregnation.

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The ordinary Computation of going with-Child obſerveth that time which our Bleſſed Saviour, the Perfecteſt of all Men did fulfil in the Virgins Womb; namely from the Day of Annunciation, which is in March, to the Bleſſed day of His Nativity, which is celebrated in December; and according to this Rule the Sager Matrons, keeping their Account (while they caſt in the wonted day in every Month wherein they were accuſtomed to have their Purgations) they are ſeldom out of their Reckoning; but Ten Revolutions of the Moon being expired, they are delivered, and reap the fruit of their Womb upon that very day; whereon were it not for their Pregnation their Purgations would enſue.

Source: wiktionary