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My fear is you may have done too much before the duckling was ready. Sit tight and leave it be for now.

What are you keeping your humidity at? You're just over halfway through the development time but the air cell is a couple days away from hatch size. I'd raise the humidity 10% from where you have it, but not higher than 65%, for about three days and candle again. They should not be any larger...

If that's a chicken egg, I'd shoot for just a touch higher humidity next time. And the embryo size looks a little on the small side for day 16, at least to me. What temps have you been running? If it's a duck egg, then the air cell looks too big for the timeline, but the embryo size looks...

Most definitely keep them incubating for a couple of days. If you catch a bad odor or see "wet" eggs than find and dump those, but otherwise candle at 7 to 10 days and look for veins up to the air cell.

If they failed in the first week, it's usually due to temperature, either too cold or too hot. Before you set any more eggs, be sure to check your incubator with calibrated thermometers.