Izzy tells Nina about her meeting with her advisor and her assigned volunteer activity in episode 3x03 "Tourist Lesbians and Millennial Twats". Emma approaches Jack as he is getting coffee to tell him about the pregnancy in episode 3x04 "Inconceivable!". Emma tells Jack about the pregnancy and Izzy spies them from her advisor's office above in episode 3x05 "Welcome to the Tiger Cage". Appears in 1 more episode.
Source: Greg Poehler — Instagram