question about fisher clock

i want to know that 2sec add before my move or 2sec add after my move at fide rule
*add before setting
opponent play move and push clock -> add 2sec at my time -> start my turn -> i play move and push clock -> add 2sec at opponent time -> start opponent turn
*add after setting
i play move and push clock -> add 2sec at my time -> start opponent turn -> opponent play move and push clock -> add 2sec at opponent time -> start my turn
question about fisher clock
increment add before move or add after move at fide rule ?
i have saitek game clock
saitek have 2 opion "add before", "add after"
"add before" is usual setting, "add after" is not usual setting
but i have been to fide tournament
i remember that clock setting is "add after"
what is correct ?