<P> It is revealed in "JJ", that JJ had twice rejected a promotion to The Pentagon and hid the offers from her superiors . However, she is finally forced to transfer by "the brass". JJ's departure reflects that Cook was let go at the beginning of season six, for financial reasons relating to the premiere of the spin - off Criminal Minds: Suspect Behavior . JJ's time at the Pentagon was revealed in depth in season nine . </P> <P> Cook later returned for the departure of Paget Brewster (Agent Emily Prentiss). In the episode titled "Lauren", JJ receives a call and returns to help the BAU find Emily and capture Ian Doyle . The episode ends with Emily presumed dead after being stabbed with a broken chair leg in the stomach . It is later revealed that Emily is alive and in Paris with JJ's help, providing her passports from three different countries and a bank account in each "to keep her comfortable". In the season six finale, JJ returns in order to tell David Rossi that she is "coming back". </P> <P> In "200", it was revealed that JJ's transfer was a backstop and that she was actually put on a task force in the Middle East with Mateo Cruz (who later became the section chief of the BAU following Strauss's death). During this time, she witnessed a mission she had pushed for fail and discovered one of the task force's informants dead . In February 2011, while overseas, she discovered that she was pregnant . However, in April 2011, following the events of "Lauren", during an attack on the task force, she was wounded and miscarried the baby . She didn't initially tell Will of the pregnancy, and it remained a secret between her and Cruz . In "The Forever People", when she starts showing signs of PTSD, Reid calls her on it, and he tries to help her and talk to her . She eventually admits she had a miscarriage due to the attack on her convoy, and asks him to keep it between them . </P> <P> The season seven premiere reveals that JJ has returned to the Behavioral Analysis Unit, having received the training to become a full - time profiler, instead of the Media Liaison, a position which has been split between Hotch and Garcia . </P>

When does jj find out she's pregnant