I have 4 babies out.1 more that is almost zipped but has been like that for over 24hrs.he will more than likely not make it.the rest of the 18eggs are not doing anything.I candled at day 17 then set the bator everything looked good at that time.the humidity and temps have been right on the money.I nver opened the bator.Today is day 21 should I get a new bator?