<Tr> <Th> 58 </Th> <Td> 9 </Td> <Td> "Local Hero" </Td> <Td> Grant Harvey </Td> <Td> Leila Basen and David Preston </Td> <Td> December 5, 2010 (2010 - 12 - 05) </Td> <Td> 409 </Td> </Tr> <Tr> <Td_colspan="7"> Ty and Amy find a calf in the woods which leads them to Tim's stolen cattle . Tim convinces the family that they need to take the law into their own hands . But the cattle rescue and subsequent drive has to maneuver a dangerous course when they come face to face with the rustlers who shot Tim two years ago, and Mallory's attempt to be part of the adventure puts her in harm's way . Val's efforts to convince Ashley and Caleb to sign a marriage contract leads to a shocking revelation . They are not legally married . Lou returns home from Dubai, in no mood to answer questions about her marriage or why she isn't with her husband . </Td> </Tr> <Tr> <Th> 59 </Th> <Td> 10 </Td> <Td> "Mood Swings" </Td> <Td> Grant Harvey </Td> <Td> Heather Conkie </Td> <Td> January 2, 2011 (2011 - 01 - 02) </Td> <Td> 410 </Td> </Tr> <Tr> <Td_colspan="7"> Grant and Blair--Ty's travel buddies--return to Heartland . The issue of Blair kissing Ty and deciding not to tell Amy is resolved with Ty and Amy breaking up and Ty leaving Heartland to move in with Caleb and Ashley. Also, Caleb and Ashley have difficulty adjusting to the reality that they aren't legally married . Caleb receives advice from Tim . Mallory's adventure of being locked in the horse trailer and being returned to Heartland by the police is still reverberating . Meanwhile, Lou gets news that will have a huge impact on her and Peter's lives . </Td> </Tr>

What episode of heartland does lou find out she is pregnant