idiom
have second thoughts
निर्णय पर संदेह करना
Meaning
to start having doubts about a decision you have made
Example
I'm having **second thoughts** about buying such an expensive car.
मैं **सेकंड थॉट्स** महसूस कर रहा हूं कि इतना महंगा कार खरीदूं।