I have a white campbell broody duck but i haven't got a drake. I am wondering if i could put hen eggs under my broody duck.

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I would be careful there. If your duck is a swimmer and then goes to sit on eggs she will be awful wet underneath and that will cause the chicken eggs to soften and crush quite easily. Chicken eggs are not as tough as duck eggs.
OK to put duck eggs under a chicken but I dunno about the other way around... Even while incubating duck and geese eggs I as a rule spray the eggs with water every few days so the shell doesn't become too hard for the ducklings to pip out of their eggs...
Good luck tho if you do try but be prepared for crushed damp eggs.. Steve