<Tr> <Th> 156 </Th> <Td> 17 </Td> <Td> "Love is Just a Word" </Td> <Td> Dean Bennett </Td> <Td> Mark Haroun </Td> <Td> March 13, 2016 (2016 - 03 - 13) </Td> <Td> 917 </Td> </Tr> <Tr> <Td_colspan="7"> While trying to help Cass learn to handle a spirited horse, Amy discovers there is more riding on their success than she initially realized . Tim insists the entire Heartland family attend a Hudson holiday party where Lou is forced to deal with a series of unexpected events . </Td> </Tr> <Tr> <Th> 157 </Th> <Td> 18 </Td> <Td> "Resolutions" </Td> <Td> Dean Bennett </Td> <Td> Heather Conkie </Td> <Td> March 20, 2016 (2016 - 03 - 20) </Td> <Td> 918 </Td> </Tr> <Tr> <Td_colspan="7"> When their plans to get away are thwarted, Amy and Ty celebrate their first anniversary closer to home and Amy reveals that she is pregnant . </Td> </Tr>

What episode of heartland does amy find out she is pregnant