Where Does the Word Pregnant Come from?

The word "pregnant" comes from the Latin pre- meaning before + (g)natus meaning birth = before (giving) birth. The word "prenatal" has exactly the same origin.

Why does enceinte mean pregnant?

Carrying an unborn child; pregnant. [French, from Old French, ultimately from Latin inciēns, pregnant; see keuə- in Indo-European roots.]

Is the word pregnant vulgar?

Several years ago, when Prince George was a baby, a palace insider gave the scoop to Us Weekly that the Queen finds the word “pregnant” to be vulgar, preferring instead to use the term “in the family way.” In fact, the word “pregnant” is one of the Queen's many pet peeves.