Are you absolutely sure you have your days right? Unfortunately one of the things that happens with these really late chicks (I know because I had one hatch on day 23) is that they have trouble with their knees. The joints get stuck because they cant straighten out in the shell so if these do hatch be prepared for some issues. I am not an expert at this by any means and there may be other issues that happen, or there may be none and the chicks will be fine. Look for the 'assisted hatch' posts on here. Somewhere there is a description of getting into the air cell to check for movement and to assist the chick. I understand how awful this is, I really do. Take a deep breath, do some more reading from some of the experts here and make a decision about what to do, or not to do