Need advise from feeder breeders.

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One of my rats is pregnant and I suspect that a wild rat did the deed even though we have not seen any wild rats inside. My females don't get let loose around the males cage and the males don't get let loose around the females cage because I have been told that rats can breed through the cage bars so I don't think it was one of them. Me and my brother really don't want to have anymore rats since we have 19 already so I think I am going to euthanize them and feed them to the Rosy that I am getting. The thing is that I have read that you should not pull the whole litter unless they are weened since the mom will still be producing milk. I am interested in knowing what feeder breeders on here do when they need rat pups/fuzzies. Also will two week old rats be old enough to gas humanly?