'Click' when shifting to 2nd gear.

When taking off for the first drive of the day, my truck ('07 w/61k) shifts to 2nd gear it makes a click noise, and then it's fine after that. After the first click, for example, stopping at red lights are fine from 1st to 2nd gear. Should this be something I need to be worried about? Should I take it to a transmission place to get it checked out before something worse happens? Thanks for the help.