When does jax find out Tara is pregnant?

Jax Teller finds out that Tara is pregnant in the episode titled "To Be, Act 1," which is the first episode of Season 6 of Sons of Anarchy. Tara reveals her pregnancy to Jax during a conversation in the hospital, where they are dealing with the aftermath of a violent incident. This revelation adds significant emotional weight to Jax's decisions and actions throughout the season.