My very sweet and friendly ducks have gone broody on their non fertilized eggs a few times.  Each time when I approached their nest they hissed at me!  They wouldn't take treats from my hands and they pretended we didn't love each other.  Even my pekin who follows me so closely I can barely walk and gazes at me intently with love eyes shunned me.
I don't know what would happen if they had actual ducklings.
But these ducks who turned on me when broody?  3 of them were adopted as year old adults.  They were terrified of me, and within months I had tamed them into friendly ducks who came when I called, happily followed me around, and ate from my hands.  They'll never be imprinted on me, of course.
Have you thought about what you'll do with the males if you breed?