The process of raising doubt or coming to a different conclusion through further consideration; the doubts or new conclusion resulting from this process.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "second thoughts" in a sentence
"Still, scared he might be going to have second thoughts if he guessed how really utterly discomposed she felt, she managed a smile for him as he let go of her hand to feel above the door."
"When the Sogdians heard that Alexander was in their country, they began to have second thoughts about Bessus."
"Maddy tucked her escaping hair behind her ear, suddenly having second thoughts about her grand plan to seduce William Killkenny."