While it is not uncommon for actors to hide their pregnancies while filming a show or movie, Aniston has stated in interviews that she was not pregnant during the filming of Friends. In fact, during the show's final season, her character even went through a storyline where she struggled with fertility issues and the possibility of using a sperm donor to have a child.
Aniston has also spoken about her desire to start a family in the past, but she has said that she did not want to have children while the show was still filming. She has stated that she wanted to focus on her career and the show during that time and that she did not want to have to balance being a mother and an actor at the same time.
In addition, the show's creators and writers have also stated that they did not want to include a pregnancy storyline for Rachel Green, as they felt it would take away from the other characters and their storylines. They also wanted to keep the focus of the show on the friendships and relationships between the six main characters, rather than adding in a baby or children.
After Friends ended its run, Aniston went on to have a successful career in film and television, starring in hit movies such as Marley & Me, The Break-Up, and Horrible Bosses. She has also returned to television with a starring role in the Apple TV+ series The Morning Show.
Despite not being pregnant during the Friends series, Aniston has spoken about her desire to have children in the past. In an interview with People magazine in 2008, she stated, "I hope to have a family. That's at the top of my to-do list."
In 2012, Aniston married actor Justin Theroux, but the couple announced their separation in 2018. Since then, Aniston has focused on her career and has not had any children.
While many fans of the Friends series may have speculated that Jennifer Aniston was pregnant during the show's run, she has stated that she was not pregnant and that her character, Rachel Green, was also not depicted as pregnant. The show's creators and writers also stated that they did not want to include a pregnancy storyline for the character. Aniston has since focused on her career and has not had any children.