"Pregnant" as a taboo word

This recent article from The Sun states that the term pregnant, in this specific case referred to Meghan Markle, is considered vulgar by the Queen.

According to a recently-resurfaced Us Weekly feature, the term is one of Her Majesty's pet peeves.

The piece - which was published back when Prince George was a baby - quotes a Palace source as saying she finds it "vulgar".

So, what will the 92-year-old be calling mum-to-be Meghan?

The article states that she'll be telling people she's "in the family way".

Apart from the Queen's personal preferences, I found that the term pregnant:

Retained its status as a taboo word until c. 1950. (Etymonline)

from which, probably, its perceived "vulgarity”.

The above statement apprears to be confirmed also by the following article from tv.avclub.com:

More than 60 years ago, a pregnant Lucille Ball couldn’t call herself “pregnant”.

• The script for “Lucy Is Enceinte” famously had to dance around saying the word “pregnant,” a term CBS deemed too vulgar for air.”

Questions:

• why was the term considered vulgar?




• and what more commonly accepted expressions were used to refer to someone who was "pregnant” in the '50s.