1) Afterthought 2) Rethink 
• (n.) The act of reconsidering, or the state of being reconsidered; as, the reconsideration of a vote in a legislative body.
Re`con·sid`er·a'tion noun The act of reconsidering, or the state of being reconsidered; as, the reconsideration of a vote in a legislative body. 
[n] - a consideration of a topic (as in a meeting) with a view to changing an earlier decision 2. [n] - thinking again about a choice previously made
second thought noun thinking again about a choice previously made; `he had second thoughts about his purchase`