So i have a mixed batch of duck eggs that i put in the incubator the same day. They are all alive and have pipped through the air sac except for one. This one has looked differently when candling these 24 days in the sense that the others were dark near the air sac and this one i think might've developed upside down? Its still alive as i see movement but im worried it wont be able to hatch. All the duck eggs come from breeds that hatch in 25-28 days. This is also my first time incubating and im really worried about that egg. This is the 24th day and they started pipping the air sac the 22nd and 23rd except that one.