1) When does sajdah sahv apply, if I cough sneeze clear throat or my lips move with spit do I need to do sajdah sahv?

2) If during salaam I get doubt if I did tashahud if I went back and repeated is it ok?

For next time should I ignore the doubt or repeat ( both for jamaat and furada)

by

1. No sajdah
2. Yes
If you’re frequently doubtful then you ignore your doubts