Trainor, 29, made the announcement during an appearance on the Today Show. She and Sabara, 30, share a son, Riley, who was born in February 2021, according to People Magazine.
Trainor is reportedly four months into her second pregnancy, according to People. She told the magazine that so far, her pregnancy is different from her first one.
“It’s like a real pregnancy. The first one was like make-believe, Trainor said. “I had no symptoms with Riley, to the point where I was like, ‘We need to go to the doctor. There’s nothing in me.’ I got my symptoms late in my pregnancy with Riley.”
Trainor also announced on the Today Show that she has written a book called, “Dear Future Mama,” which is due for release on April 25.
According to People, the book details Trainor’s experience with pregnancy. Others on her journey, such as her OB-GYN and personal trainer, weigh in, as well.
Meghan Trainor through the years LOS ANGELES, CALIFORNIA - FEBRUARY 07: Meghan Trainor attends the Delta Air Lines celebrates 2019 GRAMMYs held at Mondrian Hotel on February 07, 2019 in Los Angeles, California. (Photo by Michael Tran/Getty Images) (Michael Tran/Getty Images)
Meghan Trainor through the years NEW YORK, NEW YORK - SEPTEMBER 10: Meghan Trainor attends the front row for Christian Cowan during New York Fashion Week: The Shows at Gallery II at Spring Studios on September 10, 2019 in New York City. (Photo by Bennett Raglin/Getty Images for NYFW: The Shows) (Bennett Raglin/Getty Images for NYFW: The Shows)
Meghan Trainor through the years NEW YORK, NEW YORK - SEPTEMBER 08: Meghan Trainor attends TOMMYNOW New York Fall 2019 - Front Row & Atmosphere at The Apollo Theater on September 08, 2019 in New York City. (Photo by Brad Barket/Getty Images for Tommy Hilfiger) (Brad Barket/Getty Images for Tommy Hilfiger)
Meghan Trainor through the years LOS ANGELES, CALIFORNIA - NOVEMBER 20: (EDITORIAL USE ONLY) Meghan Trainor attends the 2022 American Music Awards at Microsoft Theater on November 20, 2022 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images) (Frazer Harrison/Getty Images)
Meghan Trainor through the years WEST HOLLYWOOD, CALIFORNIA - JUNE 08: Meghan Trainor performs at day 2 of LA Pride 2019 on June 07, 2019 in West Hollywood, California. (Photo by Amy Sussman/Getty Images) (Amy Sussman/Getty Images)
Meghan Trainor through the years HOLLYWOOD, CALIFORNIA - JULY 09: (L-R) Daryl Sabara and Meghan Trainor attend the premiere of Disney's "The Lion King" at Dolby Theatre on July 09, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images) (Kevin Winter/Getty Images)
Meghan Trainor through the years HOLLYWOOD, CALIFORNIA - MARCH 08: Meghan Trainor attends the 2020 Christian Cowan x Powerpuff Girls Runway Show on March 08, 2020 in Hollywood, California. (Photo by Amy Sussman/Getty Images) (Amy Sussman/Getty Images)
Meghan Trainor through the years LOS ANGELES, CALIFORNIA - FEBRUARY 10: Daryl Sabara and Meghan Trainor attend the 61st Annual GRAMMY Awards at Staples Center on February 10, 2019 in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images) (Jon Kopaloff/Getty Images)
Meghan Trainor through the years INGLEWOOD, CALIFORNIA - APRIL 25: Meghan Trainor performs at WE Day at The Forum on April 25, 2019 in Inglewood, California. (Photo by Jerod Harris/Getty Images) (JEROD HARRIS/Getty Images)
Meghan Trainor through the years STUDIO CITY, CA - MAY 30: Meghan Trainor attends the premiere of Fox's "The Four: Battle For Stardom" Season 2 at CBS Studios - Radford on May 30, 2018 in Studio City, California. (Photo by Rich Fury/Getty Images) (Rich Fury/Getty Images)
Meghan Trainor through the years NEW YORK, NEW YORK - FEBRUARY 05: Meghan Trainor attends The American Heart Association's Go Red for Women Red Dress Collection 2020 at Hammerstein Ballroom on February 05, 2020 in New York City. (Photo by Mike Coppola/Getty Images for American Heart Association ) (MIKE COPPOLA/Getty Images for American Heart )