will i gain weight for drinking too much diet soda today?

i (f25) had a idiotic breakfast consisting of 600 calories of cheese and saltines so ive been insanely thirsty all day but i cant stand waters taste personally and ive never been able to. today ive been drinking non stop diet sodas not even for thirst but because i just love fizzy drinks. today ive shared 6 cans of diet coke with my roomate and thats over a 2 liters and im just worried its gunna make me gain weight. today i weighed at 161.4 lbs. what could i do to combat any weight gain? any help would be appreciated.