Sammy Jo tells Clay she is pregnant in "The Choice", and they marry in "The Letter". She finds out she is not pregnant but is afraid to tell Clay; she eventually does, and they dissolve the marriage in "The Birthday".
Sammy Jo shares her pregnancy news with Clay in "The Choice," and they formalize their union in "The Letter." Later, when she realizes she's not pregnant, she decides to disclose the truth to Clay, resulting in the demise of their marriage in "The Birthday."