Question: Who was Audrey Williams pregnant with during the recording of "Dear Brother"?

Context paragraphs:
I Won't Be Home No More: "I Won't Be Home No More" is a song written by Hank Williams on July 11, 1952.  It was released posthumously on MGM Records a year later in July 1953.  It was recorded at the same session that produced the classic "You Win Again" and has a similar theme, albeit in a more blithesome tone, that probably reflects Hank's bitterness towards his ex-wife Audrey Williams (Hank and Audrey were legally divorced the day before the session).  As Colin Escott notes, "Even though it's suppose to be a lighthearted song, Hank seems vindictive, even spiteful."  It was recorded at Castle Studio in Nashville with Jerry Rivers (fiddle), Don Helms (steel guitar), and Harold Bradley (rhythm guitar), while it is speculated that Chet Atkins played lead guitar and Ernie Newton played bass.  The song climbed to #4 on the country singles chart.

Death of Hank Williams: Hiram King "Hank" Williams died on January 1, 1953.  Williams was an American singer-songwriter and musician regarded as one of the most significant country music artists of all time.  Williams was born with a mild undiagnosed case of spina bifida occulta, a disorder of the spinal column, which gave him lifelong pain—a factor in his later abuse of alcohol and drugs.  In 1951, Williams fell during a hunting trip in Tennessee, reactivating his old back pains and causing him to be dependent on alcohol and prescription drugs.  This addiction eventually led to his divorce from Audrey Williams and his dismissal from the Grand Ole Opry.

Audrey Williams: Audrey Mae Sheppard Williams (February 28, 1923 – November 4, 1975), was an American musician known for being the first wife of country music icon Hank Williams, Sr. and the mother of Hank Williams, Jr.

I Saw the Light (film): I Saw the Light is a 2015 American biographical drama film directed, written, and produced by Marc Abraham, starring Tom Hiddleston as country music legend Hank Williams and Elizabeth Olsen as his first wife, Audrey Williams.  It is based on the book "Hank Williams: The Biography" by Colin Escott, George Merritt, and William (Bill) MacEwen.  It was screened in the Special Presentations section of the 2015 Toronto International Film Festival.

On the Evening Train: "On the Evening Train" is a song by Hank Williams.  It appeared on a 1991 album "Hank Williams Songbook".  It is the only song whose authorship is credited to Hank Williams and his wife Audrey Williams, although Audrey maintained that she made contributions to the song "Wedding Bells," which is credited to Williams and his producer Fred Rose.

Hank Williams on Stage: Hank Williams on Stage is the title of a posthumous live album of Hank Williams released by his record label, MGM in 1962 (see 1962 in country music).  The performance is officially credited to Hank Williams and his Drifting Cowboys with Hank's first wife Audrey Williams, who sings back-up vocals.  It was recorded as part of the "Health and Happiness Broadcasts" at the old Castle Recording Studio at Eighth and Church Streets in Nashville in October 1949.  Long-time WSM announcer Grant Turner hosted the event and wrote the album's liner notes.  This release has long since been supplanted by the complete "Health and Happiness" recordings.

Audrey Williams (archaeologist): Audrey Williams or Audrey Davies (1902 – 1978) was a Welsh archaeologist.  She was the first woman president of the Royal Institution of South Wales.

Dear Brother (Hank Williams song): "Dear Brother" is a duet by Hank Williams and Audrey Williams.  It was released by MGM Records in 1950.  They recorded it with Fred Rose producing at Castle Studios in Nashville on March 1, 1950 and were backed by Dale Potter (fiddle), Don Davis (steel guitar), Zeke Turner (lead guitar), Clyde Baum (mandolin), Jack Shook (rhythm guitar), and probably Ernie Newton (bass).  Audrey was six months pregnant at the time of the recording.  By February 1950 it had sold 739 copies.

The Pale Horse and His Rider: "The Pale Horse and His Rider" is a hymn written by Ervin Staggs, Johnnie Bailes, Z. Clements, and M.D. Wright.  It was recorded in 1951 as a duet by Hank Williams and his wife Audrey Williams and released as a single by MGM Records in 1956 as the B-side to "A Home in Heaven.  It is likely that Williams learned the song from its co-writer Johnny Bailes when he worked with the Bailes Brothers in Shreveport in 1948 and 1949, but the song dated back to 1939 when Bailes was working with Molly O'Day and Ervin Staggs at WCHS in Charleston, West Virginia.  Hank and Audrey were backed on the session by Jerry Rivers (fiddle), Don Helms (steel guitar), Sammy Pruett (electric guitar), Jack Shook (rhythm guitar), and Howard Watts or Ernie Newton (bass).

Holly Williams: Holly Audrey Williams (born March 12, 1981) is an American singer-songwriter and musician.  She is the granddaughter of Hank Williams, Sr., the daughter of Hank Williams, Jr. and half-sister of Hank Williams III.  Williams has released three studio albums: "The Ones We Never Knew" in 2004, "Here with Me" in 2009 and "The Highway" in 2013.  "The Highway" was released on Williams' own label, Georgiana Records and reached number 146 on the "Billboard" 200.

Supporting paragraphs: Dear Brother (Hank Williams song) Audrey Williams
Answer: Hank Williams, Jr.